# T4 vs Taf

> English confusable word pair

## The two words

### T4
*noun · IPA /ˌtiːˈfɔː/ · frequency rank #29,116*
Abbreviation of tetraiodothyronine (“thyroxine”).

### Taf
*name · frequency rank #49,663*
A river in Pembrokeshire and Carmarthenshire, West Wales, which flows into Carmarthen Bay.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-09-03.
Canonical page: https://plainspell.com/en/vs/t4-vs-taf