* Butt (noun)
* Cut (verb)
* Debt (noun)
* Fett (a surname, like Boba Fett)
* Get (verb)
* Hit (verb)
* Jet (noun)
* Knit (verb)
* Let (verb)
* Mitt (noun)
* Net (noun)
* Put (verb)
* Quit (verb)
* Set (verb)
* Spit (verb)
* Split (verb)
* Stut (an archaic word for "stutter")
* Wet (adjective)
* Whet (verb)
* Yett (a variant spelling of "yet")
It's worth noting that many of these words are relatively short and common, making it difficult to find longer, more complex words ending in "tt."