arch vs arma, What's the Difference?

Which to use

“arch” is a verb and “arma” is a noun - they look or sound alike but fill different roles in a sentence.

#35,879
“arch” frequency rank: #1,913
“arma” frequency rank: 37792
confusion score

Side-by-Side Comparison

Feature	arch	arma
Definition	arquear, tomar a forma de um arco	instrumento usado para ataque e defesa

Letter map: arch vs arma

Shared letters muted; letters that set arch and arma apart highlighted. Shared run: 2.

4 ch

arch

4 ch

arma

Role in the sentence - arch and arma

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: arch is averb and armaanoun. On the page they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 37792, derived from the frequency rank of both members and their visual similarity.

arch is recorded at frequency rank #35,879, classified as averb. arma is at rank #1,913, tagged as anoun, pronounced /ˈaɾmɐ/.

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 37792, this pair ranks #28,782 of 75,631 scored Portuguese confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of arch vs arma

Shared letters: ar. Private to "arch": ch. Private to "arma": m.

"arch" · 4 letters · shape VCCC · "arma" · 4 letters · shape VCCV

Known mistypes of this pair

arch ← acrh · arcch · archh · arhc · arrch · rach
arma ← amra · aram · armma · arrma

Frequently Asked Questions

Is swapping "arch" for "arma" ever safe?

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

Which is more common, "arch" or "arma"?

"arma" is the more common of the two: it sits at frequency rank #1,913 in our Portuguese list, against #35,879 for "arch". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

What to do next

Pair "arch" vs "arma" is on the table, pick a follow-up below.

Full dictionary entry for "arch" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "arma" - compare definitions side by side with the headword page. Word entry
This pair ranks #28,782 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"arch" and "arma" also get mixed up with nearby pairs, the highest-scored neighbour is "acs vs arch". 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 #28,782 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.