# underlie vs underside

> English confusable word pair

## The two words

### underlie
*verb · IPA /ˌʌn.dəˈlaɪ/ · frequency rank #42,970*
To lie in a position directly beneath something.

### underside
*noun · IPA /ˈʌndəˌsaɪd/ · frequency rank #21,396*
The side that is below or underneath, the bottom.

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