Which to use
“constrain” is a verb and “constraint” is a noun - they look or sound alike but fill different roles in a sentence.
- #36,089
- “constrain” frequency rank
- #20,072
- “constraint” frequency rank
- 56161
- confusion score
Side-by-Side Comparison
| Feature | constrain | constraint |
|---|---|---|
| Definition | To force physically, by strong persuasion or pressuring; to compel; to oblige. | Something that constrains; a restriction. |
Where the eye mixes constrain and constraint
Muted = shared; highlighted = the visual trap. They share 9 letters in sequence.
Look-alike desk: constrain vs constraint
These two trip readers on the page rather than in the ear: constrain is /kənˈstɹeɪn/ while constraint is /kənˈstɹeɪnt/. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 extra letter(s) - “constrain” sits inside “constraint”, and the parts of speech differ too (verb vs noun), which is usually the fastest check. Our composite confusion score for this pair is 56161, derived from the frequency rank of both members and their visual similarity.
constrain is recorded at frequency rank #36,089, classified as averb, pronounced /kənˈstɹeɪn/. constraint is at rank #20,072, tagged as anoun, pronounced /kənˈstɹeɪnt/.
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 56161, this pair ranks #128,246 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of constrain vs constraint
Shared letters: acinorst. Private to "constrain": -. Private to "constraint": -.
"constrain" · 9 letters · shape CVCCCCVVC · "constraint" · 10 letters · shape CVCCCCVVCC
Known mistypes of this pair
- constrain ← cconstrain · cnostrain · connstrain · consrtain · consstrain · constarin · constrainn · constrani
- constraint ← cconstraint · cnostraint · connstraint · consrtaint · consstraint · constarint · constrainnt · constraintt
Frequently Asked Questions
Can "constrain" and "constraint" be used interchangeably?
Which is more common, "constrain" or "constraint"?
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 "constrain" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "constraint" - compare definitions side by side with the headword page. Word entry
- This pair ranks #128,246 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "constrain" and "constraint" also get mixed up with nearby pairs, the highest-scored neighbour is "constrain vs constrained". 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 #128,246 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.