fess vs FSB, What's the Difference?

Which to use

“fess” is a verb and “FSB” is a name - they look or sound alike but fill different roles in a sentence.

#43,640
“fess” frequency rank: #32,815
“FSB” frequency rank: 76455
confusion score

Side-by-Side Comparison

Feature	fess	FSB
Definition	To confess; to admit.	The Federal Security Service of the Russian Federation.

Letter map: fess vs FSB

Shared letters muted; letters that set fess and FSB apart highlighted. Shared run: 2.

4 ch

fess

3 ch

FSB

Role in the sentence - fess and FSB

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: fess is averb and FSBaname. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 76455, derived from the frequency rank of both members and their visual similarity.

fess is recorded at frequency rank #43,640, classified as averb, pronounced /fɛs/. FSB is at rank #32,815, tagged as aname.

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 76455, this pair ranks #30,080 of 530,003 scored English confusable pairs - among the most confusable pairs.

Orthographic DNA of fess vs FSB

Shared letters: fs. Private to "fess": e. Private to "FSB": b.

"fess" · 4 letters · shape CVCC · "FSB" · 3 letters · shape CCC

Known mistypes of this pair

fess ← efss · ffess · fses

Frequently Asked Questions

Can "fess" and "FSB" be used interchangeably?

No - they are not even the same part of speech. "fess" is a verb and "FSB" a name, so a sentence built for one is usually ungrammatical with the other.

Frequency check: "fess" vs "FSB" - which ranks higher?

"FSB" is the more common of the two: it sits at frequency rank #32,815 in our English list, against #43,640 for "fess". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

After this comparison

Pair "fess" vs "FSB" is on the table, pick a follow-up below.

Full dictionary entry for "fess" 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 #30,080 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"fess" and "FSB" also get mixed up with nearby pairs, the highest-scored neighbour is "Fenn vs fess". Nearby pair
Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes

Confusion rank #30,080 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.