I can only think of dilemma.
Problem.
Problem.
A seven letter word that starts with D and ends with T: decrypt
A seven (7) letter word that starts with M and ends with O: memento
FlummoxPolymox
further
descentdecideddiamonddiscarddiscorddividedelevateerasuregaininggrowingglowinghellishlateralliterallogicalmodicumoreganoreentertangenttrident
A seven letter word that starts with D and ends with T: decrypt
spumoni
Duchess is a seven letter word.
algebra
pursuit
A seven (7) letter word that starts with M and ends with O: memento
chemise
quinine
discard
decrees.
therein
thought