Which to use
“FL” is a noun and “foul” is an adjective - they look or sound alike but fill different roles in a sentence.
- #6,140
- “FL” frequency rank
- #6,574
- “foul” frequency rank
- 12714
- confusion score
Side-by-Side Comparison
| Feature | FL | foul |
|---|---|---|
| Definition | Abbreviation of foreign language. | Covered with, or containing unclean matter; dirty. |
Letter map: FL vs foul
Shared letters muted; letters that set FL and foul apart highlighted. Shared run: 2.
Part-of-speech tell for FL / foul
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: FL is anoun and foulanadjective. On the page they differ by 2 letter(s) in length. Our composite confusion score for this pair is 12714, derived from the frequency rank of both members and their visual similarity.
FL is recorded at frequency rank #6,140, classified as anoun. foul is at rank #6,574, tagged as anadj, pronounced /faʊl/.
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 12714, this pair ranks #479,953 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of FL vs foul
Shared letters: fl. Private to "FL": -. Private to "foul": ou.
"FL" · 2 letters · shape CC · "foul" · 4 letters · shape CVVC
Known mistypes of this pair
- foul ← ffoul · folu · foull · fuol · oful
Frequently Asked Questions
Can "FL" and "foul" be used interchangeably?
Frequency check: "FL" vs "foul" - which ranks higher?
What to do next
Pair "FL" vs "foul" is on the table, pick a follow-up below.
- Full dictionary entry for "FL" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "foul" - compare definitions side by side with the headword page. Word entry
- This pair ranks #479,953 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "FL" and "foul" also get mixed up with nearby pairs, the highest-scored neighbour is "FOMO vs foul". 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 #479,953 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.