blarney
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
descentdecideddiamonddiscarddiscorddividedelevateerasuregaininggrowingglowinghellishlateralliterallogicalmodicumoreganoreentertangenttrident
scallop
There are seven oceans and none of their names start with the letter B.
avarice
One option is the word provide.
start up, sail off
Concern is the word.
new opus new work new tune
abreastabstainabridgeacclaimacrobataddressadmiredadornedadoringaerobicafflictalignedallowedamassedamendedamateurangelicanswersappealsappliedapprisearguingarousedarrangeartworkashtrayassumedattractaverageaviatoravoiding
A seven letter word that starts with D and ends with T: decrypt
success
Duchess is a seven letter word.
augment
insurer
Include