berth vs built in bed

berth and built in bed both are nouns.

Word	Noun	Adjective	Verb	Adverb
berth	Yes	No	Yes	No
built in bed	Yes	No	No	No

As nouns, berth and built in bed are synonyms defined as:

Other synonyms of berth include bunk.

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

berth (verb)	built in bed (verb)
secure in or as if in a berth or dock
come into or dock at a wharf
provide with a berth