IPA: /ˈtuːθeɪk/
KK: /ˈtuːθeɪk/
A pain that occurs in or around a tooth.
After eating too many sweets, I developed a toothache that lasted all night.
Toothache → It is formed from "tooth" (from Old English *toþ*, meaning the hard structure in the mouth used for biting and chewing) and "ache" (from Old English *æce*, meaning pain). The word "toothache" refers to the pain associated with a tooth.
Think of the hard structure in your mouth ('tooth') that causes you pain ('ache') when you have a toothache.
No commonly confused words.