Owe.
Owe
A three letter word for debt is owe.
A verb is an action word. A letter that when you say it, means of debt is the letter O. If you are in debt, you owe somebody something.
B is the silent letter.
credit
debt
owe
debt
darn, debt, dirt, dolt, dust, dyed
3 letter word for old oldsmobile
Another 3 letter word for respect is awe.