# fermi vs Ferris

> English confusable word pair

## The two words

### fermi
*noun · IPA /ˈfɜː(ɹ)mi/ · frequency rank #35,718*
An obsolete name of the unit of length equal to one femtometre (10⁻¹⁵ m).

### Ferris
*name · frequency rank #17,139*
A surname transferred from the given name derived from the given name Fergus and/or from the Norman surname Ferrers.

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