Which to use
“autumn” is a noun and “autumnal” is an adjective - they look or sound alike but fill different roles in a sentence.
- #4,576
- “autumn” frequency rank
- #38,738
- “autumnal” frequency rank
- 43314
- confusion score
Side-by-Side Comparison
| Feature | autumn | autumnal |
|---|---|---|
| Definition | Traditionally the third of the four seasons, when deciduous trees lose their leaves, and temperatures and daylight hours decrease; typically regarded as spanning the months of September, October, and November in the Northern Hemisphere, and the months of March, April and May in the Southern Hemisphere. | Of or relating to autumn. |
Where the spellings diverge
Shared letters are muted; the letters that actually set autumn and autumnal apart are highlighted. They share 6 letters in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
autumn and autumnal 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 2 extra letter(s) - “autumn” sits inside “autumnal” - close enough that the eye skips over the difference, far enough that meaning fully diverges. Our composite confusion score for this pair is 43314, derived from the frequency rank of both members and their visual similarity.
autumn is recorded at frequency rank #4,576, classified as anoun, pronounced /ˈɔːtəm/. autumnal is at rank #38,738, tagged as anadj, pronounced /ɔːˈtʌm.nəl/.
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 43314, this pair ranks #241,182 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Frequency comparison
Frequently Asked Questions
Can "autumn" and "autumnal" be used interchangeably?
Remembering autumn vs autumnal
The fastest way to pick the right one every time.
- Check the role first: if you need a noun, it's “autumn”; for an adjective, it's “autumnal”.
- See each word in full, definition, IPA, etymology and its other confusables. Full “autumn” entry
- Browse more pairs most likely to be confused. Most confusable