Which to use
“constrain” is a verb and “constraints” is a noun - they look or sound alike but fill different roles in a sentence.
- #36,089
- “constrain” frequency rank
- #9,589
- “constraints” frequency rank
- 45678
- confusion score
Side-by-Side Comparison
| Feature | constrain | constraints |
|---|---|---|
| Definition | To force physically, by strong persuasion or pressuring; to compel; to oblige. | plural of constraint |
Where the eye mixes constrain and constraints
Muted = shared; highlighted = the visual trap. They share 9 letters in sequence.
Why the eye confuses constrain with constraints
These two trip readers on the page rather than in the ear: constrain is /kənˈstɹeɪn/ while constraints is /kənˈstɹeɪnts/. Spoken aloud the problem disappears. In writing it persists, because they differ by 2 extra letter(s) - “constrain” sits inside “constraints”, and the parts of speech differ too (verb vs noun), which is usually the fastest check. Our composite confusion score for this pair is 45678, 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/. constraints is at rank #9,589, tagged as anoun, pronounced /kənˈstɹeɪnts/.
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 45678, this pair ranks #218,976 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of constrain vs constraints
Shared letters: acinorst. Private to "constrain": -. Private to "constraints": -.
"constrain" · 9 letters · shape CVCCCCVVC · "constraints" · 11 letters · shape CVCCCCVVCCC
Known mistypes of this pair
- constrain ← cconstrain · cnostrain · connstrain · consrtain · consstrain · constarin · constrainn · constrani
- constraints ← cconstraints · cnostraints · connstraints · consrtaints · consstraints · constarints · constrainnts · constrainst
Frequently Asked Questions
Do "constrain" and "constraints" mean the same thing in a sentence?
Which is more common, "constrain" or "constraints"?
Useful next steps
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "constrain" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "constraints" - compare definitions side by side with the headword page. Word entry
- This pair ranks #218,976 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "constrain" and "constraints" also get mixed up with nearby pairs, the highest-scored neighbour is "constrain vs constraint". 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 #218,976 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.