frown vs glower

frown and glower both are nouns.

Word	Noun	Adjective	Verb	Adverb
frown	Yes	No	Yes	No
glower	Yes	No	Yes	No

As verbs, frown and glower are synonyms defined as:

frown and glower: look angry or sullen, wrinkle one's forehead, as if to signal disapproval

Other synonyms of frown include lour, lower.

frown (noun)	glower (noun)
a facial expression of dislike or displeasure	an angry stare

frown (verb)	glower (verb)
look angry or sullen, wrinkle one's forehead, as if to signal disapproval	look angry or sullen, wrinkle one's forehead, as if to signal disapproval
	look at with a fixed gaze