Which to use
“sane” is an adjective and “sine” is a noun - they look or sound alike but fill different roles in a sentence.
- #11,791
- “sane” frequency rank
- #25,577
- “sine” frequency rank
- 37368
- confusion score
Side-by-Side Comparison
| Feature | sane | sine |
|---|---|---|
| Definition | Being in a healthy condition; not deranged; thinking rationally. | In a right triangle, the ratio of the length of the side opposite an angle to the length of the hypotenuse. |
Where the spellings diverge
Shared letters are muted; the letters that actually set sane and sine apart are highlighted. They share 3 letters in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
sane and sine form a confusable pair in the English index, two distinct headwords that are easily confused because they look alike, sound alike, or both. They differ by a single letter - a in “sane” becomes i in “sine” - close enough that the eye skips over the difference, far enough that meaning fully diverges. Our composite confusion score for this pair is 37368, derived from the frequency rank of both members and their visual similarity.
sane is recorded at frequency rank #11,791, classified as anadj, pronounced /seɪn/. sine is at rank #25,577, tagged as anoun, pronounced /saɪn/.
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 37368, this pair ranks #295,171 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Frequency comparison
Frequently Asked Questions
Can "sane" and "sine" be used interchangeably?
Remembering sane vs sine
The fastest way to pick the right one every time.
- Check the role first: if you need an adjective, it's “sane”; for a noun, it's “sine”.
- See each word in full, definition, IPA, etymology and its other confusables. Full “sane” entry
- Browse more pairs most likely to be confused. Most confusable