watched.
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details
dilemma, diploma
seccond
One word that fits your criteria is "distant." It starts with the letter 'd,' ends with 't,' and contains seven letters.
bastard, bustard, breaded, bearded, ..
A seven letter word that starts with D and ends with T: decrypt
discard
unoccupied
dad
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Lighthearted is a 12 letter word. Lithographed is another 12 letter word that starts with L and ends with D.