Which to use
“check” and “checkup” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #487
- “check” frequency rank
- #33,563
- “checkup” frequency rank
- 34050
- confusion score
Side-by-Side Comparison
| Feature | check | checkup |
|---|---|---|
| Definition | An inspection or examination. | A routine visit to the doctor, dentist, or the like. |
Where the eye mixes check and checkup
Muted = shared; highlighted = the visual trap. They share 5 letters in sequence.
Why the eye confuses check with checkup
A purely visual mix-up. check (/t͡ʃɛk/) and checkup (/ˈt͡ʃɛkʌp/) 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 2 extra letter(s) - “check” sits inside “checkup”. Our composite confusion score for this pair is 34050, derived from the frequency rank of both members and their visual similarity.
check is recorded at frequency rank #487, classified as anoun, pronounced /t͡ʃɛk/. checkup is at rank #33,563, tagged as anoun, pronounced /ˈt͡ʃɛkʌp/.
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 34050, this pair ranks #324,091 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of check vs checkup
Shared letters: cehk. Private to "check": -. Private to "checkup": pu.
"check" · 5 letters · shape CCVCC · "checkup" · 7 letters · shape CCVCCVC
Known mistypes of this pair
Frequently Asked Questions
Is swapping "check" for "checkup" ever safe?
Which is more common, "check" or "checkup"?
Useful next steps
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "check" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "checkup" - compare definitions side by side with the headword page. Word entry
- This pair ranks #324,091 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "check" and "checkup" also get mixed up with nearby pairs, the highest-scored neighbour is "checker vs checkup". 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 #324,091 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.