Which to use
“fast” is an adjective and “FSA” is a noun - they look or sound alike but fill different roles in a sentence.
- #767
- “fast” frequency rank
- #24,161
- “FSA” frequency rank
- 24928
- confusion score
Side-by-Side Comparison
| Feature | fast | FSA |
|---|---|---|
| Definition | Firmly or securely fixed in place; stable. | Initialism of flexible spending account or flexible spending arrangement. |
Letter map: fast vs FSA
Shared letters muted; letters that set fast and FSA apart highlighted. Shared run: 2.
Spelling & Dictionary Insight
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: fast is anadjective and FSAanoun. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 24928, derived from the frequency rank of both members and their visual similarity.
fast is recorded at frequency rank #767, classified as anadj, pronounced /fɑːst/. FSA is at rank #24,161, tagged as anoun.
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 24928, this pair ranks #398,240 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of fast vs FSA
Shared letters: afs. Private to "fast": t. Private to "FSA": -.
"fast" · 4 letters · shape CVCC · "FSA" · 3 letters · shape CCV
Known mistypes of this pair
- fast ← afst · fasst · fastt · ffast · fsat