Well, I'm grateful that I got the 'D'. I was extremely concerned that the word would be teeth again or some other repeat letter that I'd never figure out in time. So now all that I need to do, is go through the alphabet...

DEBTH
DECTH
DEDTH
DEETH
DEFTH
DEHTH
DEJTH
DEKTH
DELTH
DEMTH
DENTH
DEPTH

Yes, that's it 🥳