muvsMussConfusable pair

Quick tell: mu is a unknown, Muss is a noun, so they fill different roles in a sentence.

Which to use

“mu” is an unknown and “Muss” is a noun - they look or sound alike but fill different roles in a sentence.

#18,336
“mu” frequency rank
#83
“Muss” frequency rank
18419
confusion score

Side-by-Side Comparison

Feature mu Muss
Definition Genitiv Singular des Personalpronomens mina etwas, das absolut notwendig ist

Letter map: mu vs Muss

Shared letters muted; letters that set mu and Muss apart highlighted. Shared run: 2.

2 ch
mu
4 ch
Muss

Part-of-speech tell for mu / Muss

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: mu is anunknown and Mussanoun. On the page they differ by 2 extra letter(s) - “mu” sits inside “Muss”. Our composite confusion score for this pair is 18419, derived from the frequency rank of both members and their visual similarity.

mu is recorded at frequency rank #18,336, classified as anunknown, pronounced […]. Muss is at rank #83, tagged as anoun, pronounced [mʊs].

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 18419, this pair ranks #1,918,410 of 2,006,359 scored German confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of mu vs Muss

Shared letters: mu. Private to "mu": -. Private to "Muss": s.

"mu" · 2 letters · shape CV  ·  "Muss" · 4 letters · shape CVCC

Known mistypes of this pair

  • Mussmmuss · msus · muß · umss

Frequently Asked Questions

Is swapping "mu" for "Muss" ever safe?
No - they are not even the same part of speech. "mu" is an unknown and "Muss" a noun, so a sentence built for one is usually ungrammatical with the other.
In ordinary German text, does "mu" or "Muss" show up more?
"Muss" is the more common of the two: it sits at frequency rank #83 in our German list, against #18,336 for "mu". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

After this comparison

Pair "mu" vs "Muss" is on the table, pick a follow-up below.

  • Full dictionary entry for "mu" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "Muss" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #1,918,410 of 2,006,359 scored German confusable pairs in this corpus vintage. Corpus statistics
  • "mu" and "Muss" also get mixed up with nearby pairs, the highest-scored neighbour is "mu vs puzzles". 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 #1,918,410 of 2,006,359 scored German pairs, corpus vintage 2026-09-03, not spelling advice.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list