berth vs lower

berth and lower both are nouns.

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

As nouns, lower is a hyponym of berth; that is, lower is a word with a more specific, narrower meaning than berth:

Other hyponyms of berth include lower berth, upper, upper berth, couchette.

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

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

berth (verb)	lower (verb)
secure in or as if in a berth or dock	make lower or quieter
come into or dock at a wharf	set lower
provide with a berth	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