lower vs lowering

lower and lowering both are nouns.

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

lower (noun)	lowering (noun)
the lower of two berths	the act of causing to become less
	the act of causing something to move to a lower level

lower (adjective)	lowering (adjective)
the bottom one of two	darkened by clouds

lower (verb)	lowering (verb)
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