WordNet sense 1 (an external body part consisting of feathers or hair about the neck of a bird or other animal):

frill

WordNet sense 2 (a high tight collar):

choker, ruffle, neck ruff

WordNet sense 3 (common Eurasian sandpiper; the male has an erectile neck ruff in breeding season):

Philomachus pugnax

WordNet sense 4 ((card games) the act of taking a trick with a trump when unable to follow suit):

trumping

WordNet sense 5 (play a trump):

trump