Which to use
“fast” is an adjective and “FBS” is a noun - they look or sound alike but fill different roles in a sentence.
- #767
- “fast” frequency rank
- #32,394
- “FBS” frequency rank
- 33161
- confusion score
Side-by-Side Comparison
| Feature | fast | FBS |
|---|---|---|
| Definition | Firmly or securely fixed in place; stable. | Initialism of fetal blood sampling. |
Letter map: fast vs FBS
Shared letters muted; letters that set fast and FBS 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 FBSanoun. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 33161, derived from the frequency rank of both members and their visual similarity.
fast is recorded at frequency rank #767, classified as anadj, pronounced /fɑːst/. FBS is at rank #32,394, 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 33161, this pair ranks #331,790 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of fast vs FBS
Shared letters: fs. Private to "fast": at. Private to "FBS": b.
"fast" · 4 letters · shape CVCC · "FBS" · 3 letters · shape CCC
Known mistypes of this pair
- fast ← afst · fasst · fastt · ffast · fsat