fas vs FSB, What's the Difference?

Which to use

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

#47,890
“fas” frequency rank: #45,626
“FSB” frequency rank: 93516
confusion score

Side-by-Side Comparison

Feature	fas	FSB
Definition	Face, figure, visage.	Service de renseignement de la Russie chargé des affaires de sécurité intérieure, successeur du service de la sécurité intérieure du KGB.

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.

3 ch

fas

3 ch

FSB

Spelling & Dictionary Insight

These two trip readers on the page rather than in the ear: fas is \ˈfasː\ while FSB is \ɛf.ɛs.be\. 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 (noun vs name), which is usually the fastest check. Our composite confusion score for this pair is 93516, derived from the frequency rank of both members and their visual similarity.

fas is recorded at frequency rank #47,890, classified as anoun, pronounced \ˈfasː\. FSB is at rank #45,626, tagged as aname, pronounced \ɛf.ɛs.be\.

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 93516, this pair ranks #2,226 of 440,172 scored French 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

fas#47,890

FSB#45,626

Source: FrequencyWords open word-frequency list

Frequently Asked Questions

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

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

Which is more common, "fas" or "FSB"?

"FSB" is the more common of the two: it sits at frequency rank #45,626 in our French list, against #47,890 for "fas". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Remembering fas vs FSB

The fastest way to pick the right one every time.

Check the role first: if you need a noun, it's “fas”; for a name, 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