Which to use
“fis” is a verb and “FSB” is a noun - they look or sound alike but fill different roles in a sentence.
- #26,408
- “fis” frequency rank
- #41,175
- “FSB” frequency rank
- 67583
- confusion score
Side-by-Side Comparison
| Feature | fis | FSB |
|---|---|---|
| Definition | 1. Person Singulra Indikativ historisches Perfekt Aktiv des Verbs faire | russischer Inlandsgeheimdienst und Geheimpolizei |
Where the eye mixes fis and FSB
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence. fis (CVC) and FSB (CCC) run the same length but a different consonant-vowel pattern - the shape difference is usually the fastest tell.
Visual trap between fis and FSB
These two trip readers on the page rather than in the ear: fis is [fi] 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 67583, derived from the frequency rank of both members and their visual similarity.
fis is recorded at frequency rank #26,408, classified as averb, pronounced [fi]. 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 67583, this pair ranks #535,424 of 2,006,359 scored German confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of fis vs FSB
Shared letters: fs. Private to "fis": i. Private to "FSB": b.
"fis" · 3 letters · shape CVC · "FSB" · 3 letters · shape CCC
Frequently Asked Questions
Do "fis" and "FSB" mean the same thing in a sentence?
Which is more common, "fis" or "FSB"?
After this comparison
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "fis" 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 #535,424 of 2,006,359 scored German confusable pairs in this corpus vintage. Corpus statistics
- "fis" and "FSB" also get mixed up with nearby pairs, the highest-scored neighbour is "fist vs FSB". Nearby pair
Confusion rank #535,424 of 2,006,359 scored German pairs, corpus vintage 2026-09-03, not spelling advice.