Which to use
“perilous” is an adjective and “perils” is a noun - they look or sound alike but fill different roles in a sentence.
- #23,060
- “perilous” frequency rank
- #25,169
- “perils” frequency rank
- 48229
- confusion score
Side-by-Side Comparison
| Feature | perilous | perils |
|---|---|---|
| Definition | Dangerous, full of peril. | plural of peril |
Where the eye mixes perilous and perils
Muted = shared; highlighted = the visual trap. They share 6 letters in sequence. perilous runs 8 letters (CVCVCVVC) against perils's 6 (CVCVCC) - the length gap alone is often enough to separate them once you know to check it.
Why the eye confuses perilous with perils
These two trip readers on the page rather than in the ear: perilous is /ˈpɛɹ.ɪ.ləs/ while perils is /ˈpɛɹɪlz/. Spoken aloud the problem disappears. In writing it persists, because they differ by 2 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 48229, derived from the frequency rank of both members and their visual similarity.
perilous is recorded at frequency rank #23,060, classified as anadj, pronounced /ˈpɛɹ.ɪ.ləs/. perils is at rank #25,169, tagged as anoun, pronounced /ˈpɛɹɪlz/.
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 48229, this pair ranks #195,044 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of perilous vs perils
Shared letters: eilprs. Private to "perilous": ou. Private to "perils": -.
"perilous" · 8 letters · shape CVCVCVVC · "perils" · 6 letters · shape CVCVCC
Known mistypes of this pair
Frequently Asked Questions
Do "perilous" and "perils" mean the same thing in a sentence?
In ordinary English text, does "perilous" or "perils" show up more?
What to do next
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "perilous" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "perils" - compare definitions side by side with the headword page. Word entry
- This pair ranks #195,044 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "perilous" and "perils" also get mixed up with nearby pairs, the highest-scored neighbour is "penile vs perils". 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 #195,044 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.