# octane vs octave

> English confusable word pair

## The two words

### octane
*noun · IPA /ˈɒkteɪn/ · frequency rank #26,190*
Any of the eighteen isomeric aliphatic hydrocarbons (C₈H₁₈) found in petroleum, especially an iso-octane 2,2,4 trimethyl-pentane; they are used as fuels and solvents.

### octave
*noun · IPA /ˈɒktɪv/ · frequency rank #26,191*
An interval of twelve semitones spanning eight degrees of the diatonic scale, representing a doubling or halving in pitch frequency.

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