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 spellings diverge
Shared letters are muted; the letters that actually set constrain and constraint apart are highlighted. They share 9 letters in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
constrain and constraint form a confusable pair in the English index, two distinct headwords that are easily confused because they look alike, sound alike, or both. They differ by 1 extra letter(s) - “constrain” sits inside “constraint” - close enough that the eye skips over the difference, far enough that meaning fully diverges. 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.
Frequency comparison
Frequently Asked Questions
Can "constrain" and "constraint" be used interchangeably?
Remembering constrain vs constraint
The fastest way to pick the right one every time.
- Check the role first: if you need a verb, it's “constrain”; for a noun, it's “constraint”.
- See each word in full, definition, IPA, etymology and its other confusables. Full “constrain” entry
- Browse more pairs most likely to be confused. Most confusable