rabbit warren vs burrow

rabbit warren and burrow both are nouns.

Word	Noun	Adjective	Verb	Adverb
rabbit warren	Yes	No	No	No
burrow	Yes	No	Yes	No

As nouns, burrow is a hypernym of rabbit warren; that is, burrow is a word with a broader meaning than rabbit warren:

rabbit warren: a series of connected underground tunnels occupied by rabbits
burrow: a hole made by an animal, usually for shelter

Other hypernyms of rabbit warren include tunnel.

rabbit warren (noun)	burrow (noun)
an overcrowded residential area	a hole made by an animal, usually for shelter
a series of connected underground tunnels occupied by rabbits

rabbit warren (verb)	burrow (verb)
	move through by or as by digging