Advice or Advise, Practice or Practise: The Noun-vs-Verb Spelling Rule in OET Writing

“Please follow this advise carefully” is a sentence that looks almost right. It reads smoothly, the grammar around it is fine, and most candidates don’t even pause on the word “advise” as they write it — because it sounds identical to “advice” when spoken aloud. But it’s the wrong word, in the wrong grammatical slot, in a letter where that kind of mechanical accuracy is being scored. The same mistake, same cause, shows up a few lines later: “the patient should continue this practise at home” — another near-homophone pair where OET writing candidates confuse the noun with the verb, every time, in both directions.

Advice/advise and practice/practise are two of the most common spelling slips in OET letters, and they’re worth learning together rather than separately, because they follow exactly the same rule. Once you’ve internalised that rule for one pair, you already know it for the other.

Why do advice/advise and practice/practise get confused so often in OET writing?

Both pairs share the same underlying problem: the noun and the verb are near-homophones in spoken English, but differ by a single letter in writing — “c” for the noun, “s” for the verb. When you read your own letter back silently, your inner voice doesn’t distinguish “advice” from “advise,” so your eye has no reason to stop and check. The error survives a normal proofreading pass because nothing about the sentence sounds wrong.

There’s a second cause specific to candidates who’ve studied English, or practised medicine, in the United States. American English does not distinguish practice from practise at all — “practice” covers both the noun and the verb in US spelling. A candidate who has absorbed US spelling conventions from textbooks, case notes, or prior training isn’t making a careless mistake when they write “I will practice safe injection technique” — they’re correctly applying a rule that simply isn’t the OET-marked convention. OET letters are assessed against British English norms, where the noun/verb split is real and consistently applied.

What’s the rule for advice vs advise?

Advice is always a noun. It means a recommendation or suggestion given to someone.

• ✅ “I gave the patient advice on managing her diet.”
• ✅ “Please follow the advice outlined in this letter.”

Advise is always a verb. It means the act of giving a recommendation.

• ✅ “I advised the patient to reduce her salt intake.”
• ✅ “Please advise the patient to attend a follow-up appointment.”

Unlike some word-confusion pairs, advice/advise has no exceptions worth worrying about in clinical letters — the noun is spelled with a “c,” the verb with an “s,” full stop. The only skill required is noticing, every time, which grammatical role the word is playing in your sentence.

What’s the rule for practice vs practise in OET writing?

Practice is the noun in British English. It refers to a professional establishment, a habitual action, or an accepted standard.

• ✅ “The patient attends a local GP practice.”
• ✅ “This reflects standard clinical practice for wound management.”

Practise is the verb in British English. It means to carry out or perform an activity, often repeatedly or professionally.

• ✅ “She has practised as a registered nurse for eight years.”
• ✅ “Please practise the breathing exercises demonstrated during your appointment.”

This is the pair most likely to trip up candidates who trained or studied in the US, Canada (which also often uses “practice” for both), or any system where the distinction doesn’t exist. If you’re used to writing “I practice medicine,” that habit needs a deliberate override for OET, where the verb form takes an “s.”

Advice/advise and practice/practise side by side

How can I tell which spelling I need in a specific sentence?

The most reliable check for both pairs is the he/she substitution test: mentally rewrite the sentence with “he” or “she” as the subject, and listen for whether the word takes a spoken “-s” ending.

• “He advises patients daily” → there’s an audible -s sound → the verb is advise.
• “He gave good advice” → no -s sound after the word → it’s the noun advice.
• “She practises midwifery” → audible -s sound → the verb is practise.
• “This is standard practice” → no -s sound → it’s the noun practice.

This test works because English verbs conjugated for “he/she/it” take an -s ending (“he runs,” “she writes”), and that same pattern carries through to “advise” and “practise” when they’re genuinely functioning as verbs. If the sentence structure doesn’t support adding “he” or “she” as a natural subject performing an action, you’re almost certainly looking at the noun form instead.

A second, faster check for proofreading: scan for “the,” “a,” or “this” immediately before the word. “The advice,” “a practice,” and “this practice” are all grammatically natural with the noun; they sound wrong with the verb (“the advise,” “a practise”) — which is a useful tell if the he/she test feels slower under exam time pressure.

Does this cost marks on the OET Writing sub-test?

Yes, under the same occasional-versus-systematic distinction that applies to every Language-criterion error. A single slip — writing “advise” once where “advice” belonged, in an otherwise accurate 180-200 word letter — is unlikely to be the deciding factor in your score. Examiners are instructed to tolerate occasional errors that don’t block communication.

The real risk is defaulting to one spelling regardless of grammatical role. A candidate who always writes “practice” (the American habit) will use it correctly as a noun and incorrectly as a verb in the same letter, without realising it, because the underlying habit is consistent even though the correctness isn’t. That kind of repeated, predictable error across a script is exactly what the Language criterion is designed to flag — not as four isolated typos, but as one unlearned rule appearing four times.

A proofreading pass for advice/advise and practice/practise

Because both pairs pass spellcheck (every spelling is a real word) and sound identical read aloud, they need a dedicated check rather than a general read-through:

1. Search your letter for every instance of “advice,” “advise,” “practice,” and “practise.”
2. For each one, run the he/she substitution test. Does the sentence support “he advises” or “she practises” with an audible -s? If yes, confirm the -ise spelling is used. If no, confirm the -ice spelling is used.
3. Check for consistency, not just correctness. If you’ve used “advise” correctly once, verify every other instance independently — getting the first one right doesn’t guarantee the pattern holds for the rest of the letter.
4. If you trained or studied in the US, flag “practice” as a verb specifically. It’s the single most common slip for this profile of candidate, because the error feels completely natural.
5. Don’t rely on how the word sounds. Both pairs are homophones or near-homophones in speech — this has to be a mechanical check against the rule, not a judgement based on what “feels” right.

This takes well under a minute once you know the exact four words to search for, and it catches an error type that most grammar checkers handle inconsistently, because both words in each pair are valid, correctly spelled English.

How this fits into the Language criterion

Advice/advise and practice/practise are marked under Language, one of the six official OET writing criteria alongside Purpose, Content, Conciseness & Clarity, Genre & Style, and Organisation & Layout. The official Language criterion page sets out how this criterion is scored band by band. For the broader set of grammar patterns that most often cost Language marks, see our OET writing grammar guide, and for a closer look at a related category of near-homophone word confusions — affect/effect and prescribe/proscribe — see our word confusions in OET writing post, which also flags this exact pair as a common next trap once you’ve fixed the first two.

If you want to see both pairs explained with worked examples, watch the full breakdowns: Advise or Advice? The OET Spelling Trap and Practice or Practise? The OET Spelling Trap.

The honest limit of catching these yourself

Advice/advise and practice/practise are difficult to self-edit precisely because every spelling involved is a correct, familiar English word — your eye has no reason to pause on either one unless you already know to check for it. The free OET Grammar Checker is a reasonable first pass for surface-level errors, but a word that’s spelled correctly and sounds right read aloud is exactly the kind of mistake that benefits from a second, trained reader working against your actual case notes. Our OET writing correction service has corrected 11,000+ letters since 2014 and reviews your letter against all six official criteria — including the word-level precision errors that never look wrong to the person who wrote them. If you’re comparing options before booking, our pricing page breaks down turnaround and pack sizes from a single letter up to full exam preparation.