# API vs as

> English confusable word pair

## The two words

### API
*noun · IPA /ˌeɪˌpiˈaɪ/ · frequency rank #11,501*
Initialism of active pharmaceutical ingredient.

### as
*adverb · IPA /əz/ · frequency rank #18*
To such an extent or degree; to the same extent or degree.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/vs/api-vs-as