lower vs berth

lower and berth both are nouns.

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

As nouns, berth is a hypernym of lower; that is, berth is a word with a broader meaning than lower:

Other hypernyms of lower include built in bed, bunk.

lower (noun)	berth (noun)
the lower of two berths	a job in an organization
	a bed on a ship or train; usually in tiers
	a place where a craft can be made fast

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

lower (verb)	berth (verb)
make lower or quieter	secure in or as if in a berth or dock
set lower	come into or dock at a wharf
cause to drop or sink	provide with a berth
move something or somebody to a lower position
look angry or sullen, wrinkle one's forehead, as if to signal disapproval