Which to use
“filly” and “folly” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #23,832
- “filly” frequency rank
- #18,561
- “folly” frequency rank
- 42393
- confusion score
Side-by-Side Comparison
| Feature | filly | folly |
|---|---|---|
| Definition | A young female horse. | Foolishness that results from a lack of foresight or lack of practicality. |
Where the eye mixes filly and folly
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence. filly and folly follow the identical consonant-vowel pattern (CVCCV). Same shape at a glance is often the real trap, independent of shared letters.
Why the eye confuses filly with folly
A purely visual mix-up. filly (/ˈfɪli/) and folly (/ˈfɑli/) 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 a single letter - i in “filly” becomes o in “folly”. Our composite confusion score for this pair is 42393, derived from the frequency rank of both members and their visual similarity.
filly is recorded at frequency rank #23,832, classified as anoun, pronounced /ˈfɪli/. folly is at rank #18,561, tagged as anoun, pronounced /ˈfɑli/.
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 42393, this pair ranks #249,638 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of filly vs folly
Shared letters: fly. Private to "filly": i. Private to "folly": o.
"filly" · 5 letters · shape CVCCV · "folly" · 5 letters · shape CVCCV
Known mistypes of this pair
Frequently Asked Questions
Can "filly" and "folly" be used interchangeably?
In ordinary English text, does "filly" or "folly" show up more?
What to do next
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "filly" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "folly" - compare definitions side by side with the headword page. Word entry
- This pair ranks #249,638 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "filly" and "folly" also get mixed up with nearby pairs, the highest-scored neighbour is "feely vs filly". 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 #249,638 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.