mathvsmirthWhich spelling fits?

Which to use

“math” and “mirth” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#3,314
“math” frequency rank
#46,070
“mirth” frequency rank
49384
confusion score

Side-by-Side Comparison

Feature math mirth
Definition Clipping of mathematics. The emotion usually following humor and accompanied by laughter.

Where the eye mixes math and mirth

Muted = shared; highlighted = the visual trap. They share 3 letters in sequence.

4 ch
math
5 ch
mirth

Visual trap between math and mirth

A purely visual mix-up. math (/mæθ/) and mirth (/mɜɹθ/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by 1 letter(s) in length. Our composite confusion score for this pair is 49384, derived from the frequency rank of both members and their visual similarity.

math is recorded at frequency rank #3,314, classified as anoun, pronounced /mæθ/. mirth is at rank #46,070, tagged as anoun, pronounced /mɜɹθ/.

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 49384, this pair ranks #184,145 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of math vs mirth

Shared letters: hmt. Private to "math": a. Private to "mirth": ir.

"math" · 4 letters · shape CVCC  ·  "mirth" · 5 letters · shape CVCCC

Known mistypes of this pair

  • mathamth · maht · mathh · matth · mmath · mtah
  • mirthimrth · mirht · mirrth · mirthh · mirtth · mitrh · mmirth · mrith

Frequently Asked Questions

Is swapping "math" for "mirth" ever safe?
No. They are said differently (/mæθ/ versus /mɜɹθ/) and carry different meanings; reading the sentence aloud is usually enough to catch the wrong one.
In ordinary English text, does "math" or "mirth" show up more?
"math" is the more common of the two: it sits at frequency rank #3,314 in our English list, against #46,070 for "mirth". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

After this comparison

Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.

  • Full dictionary entry for "math" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "mirth" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #184,145 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
  • "math" and "mirth" also get mixed up with nearby pairs, the highest-scored neighbour is "mirth vs myrrh". 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 #184,145 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.

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

Source: FrequencyWords open word-frequency list