crest vs coat of arms

crest and coat of arms both are nouns.

Word	Noun	Adjective	Verb	Adverb
crest	Yes	No	Yes	No
coat of arms	Yes	No	No	No

crest (noun)	coat of arms (noun)
a showy growth of e.g. feathers or skin on the head of a bird or other animal	the official symbols of a family, state, etc.
(heraldry) in medieval times, an emblem used to decorate a helmet
the center of a cambered road
the top line of a hill, mountain, or wave
the top or extreme point of something (usually a mountain or hill)

crest (verb)	coat of arms (verb)
reach a high point
lie at the top of