bunk vs built in bed

bunk and built in bed both are nouns.

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

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

Other synonyms of bunk include berth.

bunk (noun)	built in bed (noun)
a bed on a ship or train; usually in tiers	a bed on a ship or train; usually in tiers
a rough bed (as at a campsite)
beds built one above the other
a long trough for feeding cattle
unacceptable behavior (especially ludicrously false statements)
a message that seems to convey no meaning

bunk (verb)	built in bed (verb)
flee; take to one's heels; cut and run
provide with a bunk
avoid paying