Izod
abjectadjectiveadjournadjustdejecteddisjointeddoorjambdrudgejadejudgejaundice
sand
quadquid
zand; zond;
Drag, dreg, drug...
cardcycadcupidcubedcuredcurdscrowdcriedcreedcoyedcowedcouldcotedcoxedcovedcoredcopedconedcoledcokedcooedcodedcloudcluedchordcitedchildchardceredcededcebidcavedcasedcanidcairdcagedcawedcauldcaredcapedcanedcakedcurdcuedcrudcordcoedclodcladchidchadcaid
A seven letter word that starts with D and ends with T: decrypt
watched.
discard
unoccupied
dad
Lighthearted is a 12 letter word. Lithographed is another 12 letter word that starts with L and ends with D.