warren vs tunnel

warren and tunnel both are nouns.

Word	Noun	Adjective	Verb	Adverb
warren	Yes	No	No	No
tunnel	Yes	No	Yes	No

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

Other hypernyms of warren include burrow.

warren (noun)	tunnel (noun)
a colony of rabbits	a passageway through or under something, usually underground (especially one for trains or cars)
an overcrowded residential area	a hole made by an animal, usually for shelter
a series of connected underground tunnels occupied by rabbits

warren (verb)	tunnel (verb)
	force a way through
	move through by or as by digging