Which to use
“courses” and “courtesy” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #3,223
- “courses” frequency rank
- #5,778
- “courtesy” frequency rank
- 9001
- confusion score
Side-by-Side Comparison
| Feature | courses | courtesy |
|---|---|---|
| Definition | plural of course | Polite behavior. |
Where the eye mixes courses and courtesy
Muted = shared; highlighted = the visual trap. They share 6 letters in sequence. courses runs 7 letters (CVVCCVC) against courtesy's 8 (CVVCCVCV) - the length gap alone is often enough to separate them once you know to check it.
Why the eye confuses courses with courtesy
A purely visual mix-up. courses (/ˈkɔːsɪz/) and courtesy (/ˈkɜːtəsi/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by 1 letter(s) in length. Our composite confusion score for this pair is 9001, derived from the frequency rank of both members and their visual similarity.
courses is recorded at frequency rank #3,223, classified as anoun, pronounced /ˈkɔːsɪz/. courtesy is at rank #5,778, tagged as anoun, pronounced /ˈkɜːtəsi/.
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 9001, this pair ranks #499,583 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of courses vs courtesy
Shared letters: ceorsu. Private to "courses": -. Private to "courtesy": ty.
"courses" · 7 letters · shape CVVCCVC · "courtesy" · 8 letters · shape CVVCCVCV
Known mistypes of this pair
Frequently Asked Questions
Can "courses" and "courtesy" be used interchangeably?
Which is more common, "courses" or "courtesy"?
Useful next steps
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "courses" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "courtesy" - compare definitions side by side with the headword page. Word entry
- This pair ranks #499,583 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "courses" and "courtesy" also get mixed up with nearby pairs, the highest-scored neighbour is "courtesy vs courtly". 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 #499,583 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.