# flail vs FOIL

> English confusable word pair

## The two words

### flail
*noun · IPA /fleɪl/ · frequency rank #49,921*
A tool used for threshing, consisting of a long handle (handstock) with a shorter stick (swipple or swingle) attached with a short piece of chain, thong or similar material.

### FOIL
*name · frequency rank #10,212*
An acronym for the algorithm for multiplying two binomials.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-09-03.
Canonical page: https://plainspell.com/en/vs/flail-vs-foil