Which to use
“API” and “arm” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #11,501
- “API” frequency rank
- #1,887
- “arm” frequency rank
- 13388
- confusion score
Side-by-Side Comparison
| Feature | API | arm |
|---|---|---|
| Definition | Initialism of active pharmaceutical ingredient. | The portion of the upper human appendage, from the shoulder to the wrist and sometimes including the hand. |
Where the eye mixes API and arm
Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.
Look-alike desk: API vs arm
A purely visual mix-up. API (/ˌeɪˌpiˈaɪ/) and arm (/ɑːm/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 13388, derived from the frequency rank of both members and their visual similarity.
API is recorded at frequency rank #11,501, classified as anoun, pronounced /ˌeɪˌpiˈaɪ/. arm is at rank #1,887, tagged as anoun, pronounced /ɑːm/.
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 13388, this pair ranks #476,117 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of API vs arm
Shared letters: a. Private to "API": ip. Private to "arm": mr.
"API" · 3 letters · shape VCV · "arm" · 3 letters · shape VCC
Frequently Asked Questions
Is swapping "API" for "arm" ever safe?
Frequency check: "API" vs "arm" - which ranks higher?
After this comparison
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "API" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "arm" - compare definitions side by side with the headword page. Word entry
- This pair ranks #476,117 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "API" and "arm" also get mixed up with nearby pairs, the highest-scored neighbour is "amb vs API". Nearby pair
Confusion rank #476,117 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.