Which to use
“lessen” and “lesson” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #17,888
- “lessen” frequency rank
- #3,177
- “lesson” frequency rank
- 21065
- confusion score
Side-by-Side Comparison
| Feature | lessen | lesson |
|---|---|---|
| Definition | To make less; to diminish; to reduce. | To instruct to teach. |
Same sound, different letters: lessen vs lesson
Muted letters are shared; highlighted letters are the only spelling cue when pronunciation matches. Shared run: 5 letters.
Homophone desk: lessen vs lesson
This is the hard kind. lessen and lesson are pronounced identically (/ˈlɛsən/) and both work as averb. Neither the ear nor the grammar will rescue you; only the meaning does, so the glosses below are the whole decision. They differ by a single letter - e in “lessen” becomes o in “lesson”. Our composite confusion score for this pair is 21065, derived from the frequency rank of both members and their visual similarity.
lessen is recorded at frequency rank #17,888, classified as averb, pronounced /ˈlɛsən/. lesson is at rank #3,177, tagged as averb, pronounced /ˈlɛs.ən/.
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 21065, this pair ranks #426,670 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of lessen vs lesson
Shared letters: elns. Private to "lessen": -. Private to "lesson": o.
"lessen" · 6 letters · shape CVCCVC · "lesson" · 6 letters · shape CVCCVC
Known mistypes of this pair
Frequently Asked Questions
Is swapping "lessen" for "lesson" ever safe?
Which is more common, "lessen" or "lesson"?
What to do next
Sound matches; spelling doesn't. Use the exits below to lock the right form or check a cousin pair.
- Full dictionary entry for "lessen" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "lesson" - compare definitions side by side with the headword page. Word entry
- This pair ranks #426,670 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "lessen" and "lesson" also get mixed up with nearby pairs, the highest-scored neighbour is "lessee vs lessen". 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 #426,670 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.