brow vs peak

brow and peak both are nouns.

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

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

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

brow (noun)	peak (noun)
the part of the face above the eyes	a brim that projects to the front to shade the eyes
the arch of hair above each eye	the top or extreme point of something (usually a mountain or hill)
the peak of a hill	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

brow (verb)	peak (verb)
	to reach the highest point; attain maximum intensity, activity