Which to use
“fen” and “FSB” are a confusable German pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #44,597
- “fen” frequency rank
- #41,175
- “FSB” frequency rank
- 85772
- confusion score
Side-by-Side Comparison
| Feature | fen | FSB |
|---|---|---|
| Definition | Fenn | russischer Inlandsgeheimdienst und Geheimpolizei |
Where the eye mixes fen and FSB
Muted = shared; highlighted = the visual trap. They share 1 letter in sequence. fen (CVC) and FSB (CCC) run the same length but a different consonant-vowel pattern - the shape difference is usually the fastest tell.
Look-alike desk: fen vs FSB
A purely visual mix-up. fen ([fɛn]) and FSB ([ɛfʔɛsˈbeː]) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 85772, derived from the frequency rank of both members and their visual similarity.
fen is recorded at frequency rank #44,597, classified as anoun, pronounced [fɛn]. 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 85772, this pair ranks #103,352 of 2,006,359 scored German confusable pairs - among the most confusable pairs.
Orthographic DNA of fen vs FSB
Shared letters: f. Private to "fen": en. Private to "FSB": bs.
"fen" · 3 letters · shape CVC · "FSB" · 3 letters · shape CCC
Frequently Asked Questions
Can "fen" and "FSB" be used interchangeably?
In ordinary German text, does "fen" 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 "fen" 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 #103,352 of 2,006,359 scored German confusable pairs in this corpus vintage. Corpus statistics
- "fen" and "FSB" also get mixed up with nearby pairs, the highest-scored neighbour is "fay vs fen". Nearby pair
Confusion rank #103,352 of 2,006,359 scored German pairs, corpus vintage 2026-09-03, not spelling advice.