Which to use
“prior” is an adjective and “prison” is a noun - they look or sound alike but fill different roles in a sentence.
- #1,493
- “prior” frequency rank
- #1,670
- “prison” frequency rank
- 3163
- confusion score
Side-by-Side Comparison
| Feature | prior | prison |
|---|---|---|
| Definition | Coming before in order or time; earlier, former, previous. | A place or institution where people are held against their will, in the US especially for long-term confinement, as of those convicted of serious crimes or otherwise considered undesirable by the government. |
Where the eye mixes prior and prison
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence.
Why the eye confuses prior with prison
These two trip readers on the page rather than in the ear: prior is /ˈpɹaɪ.ə/ while prison is /ˈpɹɪzn̩/. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (adjective vs noun), which is usually the fastest check. Our composite confusion score for this pair is 3163, derived from the frequency rank of both members and their visual similarity.
prior is recorded at frequency rank #1,493, classified as anadj, pronounced /ˈpɹaɪ.ə/. prison is at rank #1,670, tagged as anoun, pronounced /ˈpɹɪzn̩/.
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 3163, this pair ranks #522,921 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of prior vs prison
Shared letters: iopr. Private to "prior": -. Private to "prison": ns.
"prior" · 5 letters · shape CCVVC · "prison" · 6 letters · shape CCVCVC
Known mistypes of this pair
Frequently Asked Questions
Is swapping "prior" for "prison" ever safe?
Which is more common, "prior" or "prison"?
Useful next steps
Eye-level mix-up between "prior" and "prison" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "prior" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "prison" - compare definitions side by side with the headword page. Word entry
- This pair ranks #522,921 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "prior" and "prison" also get mixed up with nearby pairs, the highest-scored neighbour is "pir vs prior". 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 #522,921 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.