Which to use
“assume” and “assure” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #2,611
- “assume” frequency rank
- #6,438
- “assure” frequency rank
- 9049
- confusion score
Side-by-Side Comparison
| Feature | assume | assure |
|---|---|---|
| Definition | To authenticate by means of belief; to surmise; to suppose to be true, especially without proof. | To make sure and secure; ensure. |
Where the eye mixes assume and assure
Muted = shared; highlighted = the visual trap. They share 5 letters in sequence. assume and assure follow the identical consonant-vowel pattern (VCCVCV). Same shape at a glance is often the real trap, independent of shared letters.
Why the eye confuses assume with assure
A purely visual mix-up. assume (/əˈsjuːm/) and assure (/əˈʃɔː(ɹ)/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by a single letter - m in “assume” becomes r in “assure”. Our composite confusion score for this pair is 9049, derived from the frequency rank of both members and their visual similarity.
assume is recorded at frequency rank #2,611, classified as averb, pronounced /əˈsjuːm/. assure is at rank #6,438, tagged as averb, pronounced /əˈʃɔː(ɹ)/.
Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.
With a confusion score of 9049, this pair ranks #499,336 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of assume vs assure
Shared letters: aesu. Private to "assume": m. Private to "assure": r.
"assume" · 6 letters · shape VCCVCV · "assure" · 6 letters · shape VCCVCV
Known mistypes of this pair
Frequently Asked Questions
Is swapping "assume" for "assure" ever safe?
In ordinary English text, does "assume" or "assure" show up more?
After this comparison
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "assume" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "assure" - compare definitions side by side with the headword page. Word entry
- This pair ranks #499,336 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "assume" and "assure" also get mixed up with nearby pairs, the highest-scored neighbour is "assuage vs assure". Nearby pair
- Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes
Confusion rank #499,336 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.