lower vs frown

lower and frown both are nouns.

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

As verbs, lower and frown are synonyms defined as:

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

Other synonyms of lower include glower, lour.

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

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

lower (verb)	frown (verb)
make lower or quieter	look angry or sullen, wrinkle one's forehead, as if to signal disapproval
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