mvsmmWhat's the difference?

Quick tell: m is a character, mm is an abbrev, so they fill different roles in a sentence.

Which to use

“m” is a character and “mm” is an abbrev - they look or sound alike but fill different roles in a sentence.

#231
“m” frequency rank
#1,186
“mm” frequency rank
1417
confusion score

Side-by-Side Comparison

Feature m mm
Definition 13. Buchstabe des lateinischen Alphabets Einheitensymbol für Millimeter

Letter map: m vs mm

Shared letters muted; letters that set m and mm apart highlighted. Shared run: 1.

1 ch
m
2 ch
mm

Spelling & Dictionary Insight

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: m is acharacter and mmanabbrev. On the page they differ by 1 extra letter(s) - “m” sits inside “mm”. Our composite confusion score for this pair is 1417, derived from the frequency rank of both members and their visual similarity.

m is recorded at frequency rank #231, classified as acharacter, pronounced [ɛm]. mm is at rank #1,186, tagged as anabbrev.

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 1417, this pair ranks #2,004,379 of 2,006,359 scored German confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of m vs mm

Shared letters: m. Private to "m": -. Private to "mm": -.

"m" · 1 letters · shape C  ·  "mm" · 2 letters · shape CC

Frequently Asked Questions

Can "m" and "mm" be used interchangeably?
No - they are not even the same part of speech. "m" is a character and "mm" an abbrev, so a sentence built for one is usually ungrammatical with the other.
Which is more common, "m" or "mm"?
"m" is the more common of the two: it sits at frequency rank #231 in our German list, against #1,186 for "mm". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

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

Source: FrequencyWords open word-frequency list