Which to use
“fas” is a verb and “FSB” is a noun - they look or sound alike but fill different roles in a sentence.
- #38,095
- “fas” frequency rank
- #41,175
- “FSB” frequency rank
- 79270
- confusion score
Side-by-Side Comparison
| Feature | fas | FSB |
|---|---|---|
| Definition | 2. Person Singular Imperativ Präsens Aktiv des Verbs fasen | russischer Inlandsgeheimdienst und Geheimpolizei |
Where the spellings diverge
Shared letters are muted; the letters that actually set fas and FSB apart are highlighted. They share 2 letters in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
These two trip readers on the page rather than in the ear: fas is [faːs] while FSB is [ɛfʔɛsˈbeː]. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 2 positions, and the parts of speech differ too (verb vs noun), which is usually the fastest check. Our composite confusion score for this pair is 79270, derived from the frequency rank of both members and their visual similarity.
fas is recorded at frequency rank #38,095, classified as averb, pronounced [faːs]. FSB is at rank #41,175, tagged as anoun, pronounced [ɛfʔɛsˈbeː].
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 79270, this pair ranks #220,081 of 2,006,359 scored German confusable pairs - among the most confusable pairs.
Orthographic DNA of fas vs FSB
Shared letters: fs. Private to "fas": a. Private to "FSB": b.
"fas" · 3 letters · shape CVC · "FSB" · 3 letters · shape CCC
Frequency comparison
Frequently Asked Questions
Can "fas" and "FSB" be used interchangeably?
Which is more common, "fas" or "FSB"?
Remembering fas vs FSB
The fastest way to pick the right one every time.
- Check the role first: if you need a verb, it's “fas”; for a noun, it's “FSB”.
- See each word in full, definition, IPA, etymology and its other confusables. Full “fas” entry
- Browse more pairs most likely to be confused. Most confusable