# firefly vs firstly

> English confusable word pair

## The two words

### firefly
*noun · IPA /ˈfaɪ.əˌflaɪ/ · frequency rank #24,447*
Any beetle of the family Lampyridae, which exhibit bioluminescence during twilight.

### firstly
*adverb · IPA /ˈfɜɹstli/ · frequency rank #10,694*
In the first place; before anything else; first.

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