bunk bed vs bunk

bunk bed and bunk both are nouns.

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

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

bunk bed (noun)	bunk (noun)
beds built one above the other	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 bed (verb)	bunk (verb)
	flee; take to one's heels; cut and run
	provide with a bunk
	avoid paying