summit vs mountain peak

summit and mountain peak both are nouns.

Word	Noun	Adjective	Verb	Adverb
summit	Yes	No	Yes	No
mountain peak	Yes	No	No	No

As nouns, mountain peak is a hyponym of summit; that is, mountain peak is a word with a more specific, narrower meaning than summit:

Other hyponyms of summit include brow, hilltop, pinnacle.

summit (noun)	mountain peak (noun)
a meeting of heads of governments	the summit of a mountain
the top or extreme point of something (usually a mountain or hill)
the highest level or degree attainable; the highest stage of development

summit (verb)	mountain peak (verb)
reach the summit (of a mountain)