frown vs lower

frown and lower both are nouns.

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

As verbs, frown and lower are synonyms defined as:

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

Other synonyms of frown include glower, lour.

frown (noun)	lower (noun)
a facial expression of dislike or displeasure	the lower of two berths

frown (adjective)	lower (adjective)
	the bottom one of two

frown (verb)	lower (verb)
look angry or sullen, wrinkle one's forehead, as if to signal disapproval	make lower or quieter
	set lower
	cause to drop or sink
	move something or somebody to a lower position
	look angry or sullen, wrinkle one's forehead, as if to signal disapproval