# efficiency vs efficiently

> English confusable word pair

## The two words

### efficiency
*noun · IPA /ɪˈfɪʃ.ən.si/ · frequency rank #3,749*
The extent to which a resource is used for the intended purpose.

### efficiently
*adverb · frequency rank #9,739*
In an efficient manner.

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