pinnacle vs summit

pinnacle and summit both are nouns.

Word	Noun	Adjective	Verb	Adverb
pinnacle	Yes	No	Yes	No
summit	Yes	No	Yes	No

As nouns, summit is a hypernym of pinnacle; that is, summit is a word with a broader meaning than pinnacle:

Other hypernyms of pinnacle include crest, crown, peak, tip, top.

As nouns, pinnacle and summit are synonyms defined as:

pinnacle and summit: the highest level or degree attainable; the highest stage of development

Other synonyms of pinnacle include acme, elevation, height, meridian, peak, superlative, tiptop, top.

pinnacle (noun)	summit (noun)
(architecture) a slender upright spire at the top of a buttress or tower	a meeting of heads of governments
a lofty peak	the top or extreme point of something (usually a mountain or hill)
the highest level or degree attainable; the highest stage of development	the highest level or degree attainable; the highest stage of development

pinnacle (verb)	summit (verb)
raise on or as if on a pinnacle	reach the summit (of a mountain)
surmount with a pinnacle