FDA vs fei, What's the Difference?

Which to use

“FDA” is an abbrev and “fei” is a particle - they look or sound alike but fill different roles in a sentence.

#40,527
“FDA” frequency rank: #21,248
“fei” frequency rank: 61775
confusion score

Side-by-Side Comparison

Feature	FDA	fei
Definition	Food and Drug Administration	erzgebirgisch, fränkisch, süddeutsch, oberdeutsch, drückt aus, dass man annimmt, dass die oder der Angesprochene das Gesagte noch nicht weiß

Letter map: FDA vs fei

Shared letters muted; letters that set FDA and fei apart highlighted. Shared run: 1.

3 ch

FDA

3 ch

fei

Part-of-speech tell for FDA / fei

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: FDA is anabbrev and feiaparticle. On the page they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 61775, derived from the frequency rank of both members and their visual similarity.

FDA is recorded at frequency rank #40,527, classified as anabbrev. fei is at rank #21,248, tagged as aparticle, pronounced [faɪ̯].

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 61775, this pair ranks #737,172 of 2,006,359 scored German confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of FDA vs fei

Shared letters: f. Private to "FDA": ad. Private to "fei": ei.

"FDA" · 3 letters · shape CCV · "fei" · 3 letters · shape CVV

Frequently Asked Questions

Is swapping "FDA" for "fei" ever safe?

No - they are not even the same part of speech. "FDA" is an abbrev and "fei" a particle, so a sentence built for one is usually ungrammatical with the other.

Frequency check: "FDA" vs "fei" - which ranks higher?

"fei" is the more common of the two: it sits at frequency rank #21,248 in our German list, against #40,527 for "FDA". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

After this comparison

Done with this confusable. These links stay specific to "FDA" and "fei".

Full dictionary entry for "FDA" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "fei" - compare definitions side by side with the headword page. Word entry
This pair ranks #737,172 of 2,006,359 scored German confusable pairs in this corpus vintage. Corpus statistics
"FDA" and "fei" also get mixed up with nearby pairs, the highest-scored neighbour is "fay vs FDA". Nearby pair

Confusion rank #737,172 of 2,006,359 scored German pairs, corpus vintage 2026-09-03, not spelling advice.