WordNet sense 1 (garden annual with featherlike spikes of red or yellow flowers):

Celosia argentea cristata, Celosia cristata, common cockscomb

WordNet sense 2 (a conceited dandy who is overly impressed by his own accomplishments):

coxcomb

WordNet sense 3 (the fleshy red crest on the head of the domestic fowl and other gallinaceous birds):

comb