arm vs at, What's the Difference?

Which to use

“arm” is a noun and “at” is a preposition - they look or sound alike but fill different roles in a sentence.

#1,887
“arm” frequency rank: #21
“at” frequency rank: 1908
confusion score

Side-by-Side Comparison

Feature	arm	at
Definition	The portion of the upper human appendage, from the shoulder to the wrist and sometimes including the hand.	In, near, or in the general vicinity of (a particular place).

Where the eye mixes arm and at

Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.

3 ch

arm

2 ch

Visual trap between arm and at

These two trip readers on the page rather than in the ear: arm is /ɑːm/ while at is /æt/. 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 (noun vs preposition), which is usually the fastest check. Our composite confusion score for this pair is 1908, derived from the frequency rank of both members and their visual similarity.

arm is recorded at frequency rank #1,887, classified as anoun, pronounced /ɑːm/. at is at rank #21, tagged as aprep, pronounced /æt/.

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 1908, this pair ranks #526,327 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of arm vs at

Shared letters: a. Private to "arm": mr. Private to "at": t.

"arm" · 3 letters · shape VCC · "at" · 2 letters · shape VC

Frequently Asked Questions

Is swapping "arm" for "at" ever safe?

No - they are not even the same part of speech. "arm" is a noun and "at" a preposition, so a sentence built for one is usually ungrammatical with the other.

Which is more common, "arm" or "at"?

"at" is the more common of the two: it sits at frequency rank #21 in our English list, against #1,887 for "arm". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

After this comparison

Eye-level mix-up between "arm" and "at" is sorted above. Next: full entries or other pairs that share a letter shape.

Full dictionary entry for "arm" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "at" - compare definitions side by side with the headword page. Word entry
This pair ranks #526,327 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"arm" and "at" also get mixed up with nearby pairs, the highest-scored neighbour is "amb vs arm". Nearby pair

Confusion rank #526,327 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.