brow vs summit

brow and summit both are nouns.

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

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

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

brow (noun)	summit (noun)
the part of the face above the eyes	a meeting of heads of governments
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 level or degree attainable; the highest stage of development

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