roof peak vs vertex

roof peak and vertex both are nouns.

Word	Noun	Adjective	Verb	Adverb
roof peak	Yes	No	No	No
vertex	Yes	No	No	No

As nouns, vertex is a hypernym of roof peak; that is, vertex is a word with a broader meaning than roof peak:

Other hypernyms of roof peak include acme, apex, peak.

roof peak (noun)	vertex (noun)
the highest point of a roof	the point of intersection of lines or the point opposite the base of a figure
	the highest point (of something)