pinnacle vs peak

pinnacle and peak both are nouns.

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

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

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

As nouns, pinnacle and peak are synonyms defined as:

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

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

pinnacle (noun)	peak (noun)
(architecture) a slender upright spire at the top of a buttress or tower	a brim that projects to the front to shade the eyes
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 point (of something)
	the most extreme possible amount or value
	a V shape
	the highest level or degree attainable; the highest stage of development
	the period of greatest prosperity or productivity

pinnacle (verb)	peak (verb)
raise on or as if on a pinnacle	to reach the highest point; attain maximum intensity, activity
surmount with a pinnacle