crest vs top out

crest is a noun but top out is not a noun.

Word	Noun	Adjective	Verb	Adverb
crest	Yes	No	Yes	No
top out	No	No	Yes	No

As verbs, top out is a hypernym of crest; that is, top out is a word with a broader meaning than crest:

Other hypernyms of crest include peak.

crest (noun)	top out (noun)
a showy growth of e.g. feathers or skin on the head of a bird or other animal
(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)	top out (verb)
reach a high point	to reach the highest point; attain maximum intensity, activity
lie at the top of	provide with a top or finish the top (of a structure)
	give up one's career just as one becomes very successful