loosen, woolen, wooden
Third (exactly 5 letters)
Better
boxtops
dividing
reversed
benefitsfanaticalfinishedgeneralsgenerategeneroushonoraryminicampmonogamymonogrammonoxidemonorailrenegaderenewalssinistertenementvenerate
array
Chopstick.
Morsel
There are two such words: irresponsibility and apprehensiveness
pemmican
Third