lower vs go down

lower is a noun but go down is not a noun.

Word	Noun	Adjective	Verb	Adverb
lower	Yes	Yes	Yes	No
go down	No	No	Yes	No

lower (noun)	go down (noun)
the lower of two berths

lower (adjective)	go down (adjective)
the bottom one of two

lower (verb)	go down (verb)
make lower or quieter	grow smaller
set lower	stop operating
cause to drop or sink	be defeated
move something or somebody to a lower position	be ingested
look angry or sullen, wrinkle one's forehead, as if to signal disapproval	go under
	disappear beyond the horizon
	move downward and lower, but not necessarily all the way
	be recorded or remembered