Which to use
“Mach” is a name and “mph” is a noun - they look or sound alike but fill different roles in a sentence.
- #20,990
- “Mach” frequency rank
- #6,813
- “mph” frequency rank
- 27803
- confusion score
Side-by-Side Comparison
| Feature | Mach | mph |
|---|---|---|
| Definition | A surname from Czech. | Initialism of mile(s) per hour. |
Where the eye mixes Mach and mph
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Why the eye confuses Mach with mph
These two trip readers on the page rather than in the ear: Mach is /mɑːk/ while mph is /ˌɛmpiˈeɪt͡ʃ/. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (name vs noun), which is usually the fastest check. Our composite confusion score for this pair is 27803, derived from the frequency rank of both members and their visual similarity.
Mach is recorded at frequency rank #20,990, classified as aname, pronounced /mɑːk/. mph is at rank #6,813, tagged as anoun, pronounced /ˌɛmpiˈeɪt͡ʃ/.
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 27803, this pair ranks #375,987 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of Mach vs mph
Shared letters: hm. Private to "Mach": ac. Private to "mph": p.
"Mach" · 4 letters · shape CVCC · "mph" · 3 letters · shape CCC
Known mistypes of this pair
- Mach ← amch · macch · machh · mahc · mcah · mmach
Frequently Asked Questions
Can "Mach" and "mph" be used interchangeably?
In ordinary English text, does "Mach" or "mph" show up more?
What to do next
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "Mach" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "mph" - compare definitions side by side with the headword page. Word entry
- This pair ranks #375,987 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "Mach" and "mph" also get mixed up with nearby pairs, the highest-scored neighbour is "Mach vs marl". 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 #375,987 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.