Which to use
“rigor” and “rotor” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #26,577
- “rigor” frequency rank
- #16,789
- “rotor” frequency rank
- 43366
- confusion score
Side-by-Side Comparison
| Feature | rigor | rotor |
|---|---|---|
| Definition | US spelling of rigour. | A rotating part of a mechanical device; for example, in an electric motor, generator, alternator, or pump. |
Where the spellings diverge
Shared letters are muted; the letters that actually set rigor and rotor apart are highlighted. They share 3 letters in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
rigor and rotor form a confusable pair in the English index, two distinct headwords that are easily confused because they look alike, sound alike, or both. They share most of their letters but differ in 2 positions - close enough that the eye skips over the difference, far enough that meaning fully diverges. Our composite confusion score for this pair is 43366, derived from the frequency rank of both members and their visual similarity.
rigor is recorded at frequency rank #26,577, classified as anoun, pronounced /ˈɹɪɡɚ/. rotor is at rank #16,789, tagged as anoun, pronounced /ˈɹəʊ.tə/.
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 43366, this pair ranks #240,651 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Frequency comparison
Frequently Asked Questions
Can "rigor" and "rotor" be used interchangeably?
Remembering rigor vs rotor
The fastest way to pick the right one every time.
- Read both glosses above and match the meaning you intend, only context separates this pair.
- See each word in full, definition, IPA, etymology and its other confusables. Full “rigor” entry
- Browse more pairs most likely to be confused. Most confusable