glower vs scowl

glower and scowl both are nouns.

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

As verbs, scowl is a hyponym of glower; that is, scowl is a word with a more specific, narrower meaning than glower:

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

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

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