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 eye mixes fas and FSB
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence. fas (CVC) and FSB (CCC) run the same length but a different consonant-vowel pattern - the shape difference is usually the fastest tell.
Why the eye confuses fas with FSB
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
Frequently Asked Questions
Do "fas" and "FSB" mean the same thing in a sentence?
In ordinary German text, does "fas" or "FSB" show up more?
Useful next steps
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "fas" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "FSB" - compare definitions side by side with the headword page. Word entry
- This pair ranks #220,081 of 2,006,359 scored German confusable pairs in this corpus vintage. Corpus statistics
- "fas" and "FSB" also get mixed up with nearby pairs, the highest-scored neighbour is "fist vs FSB". Nearby pair
Confusion rank #220,081 of 2,006,359 scored German pairs, corpus vintage 2026-09-03, not spelling advice.