sex vs crest

sex and crest both are nouns.

Word	Noun	Adjective	Verb	Adverb
sex	Yes	No	Yes	No
crest	Yes	No	Yes	No

sex (noun)	crest (noun)
activities associated with sexual intercourse	a showy growth of e.g. feathers or skin on the head of a bird or other animal
the properties that distinguish organisms on the basis of their reproductive roles	(heraldry) in medieval times, an emblem used to decorate a helmet
all of the feelings resulting from the urge to gratify sexual impulses	the center of a cambered road
either of the two categories (male or female) into which most organisms are divided	the top line of a hill, mountain, or wave
	the top or extreme point of something (usually a mountain or hill)

sex (verb)	crest (verb)
tell the sex (of young chickens)	reach a high point
to evoke sexual feelings	lie at the top of