delve vs burrow

delve is not a noun while burrow is a noun.

Word	Noun	Adjective	Verb	Adverb
delve	No	No	Yes	No
burrow	Yes	No	Yes	No

As verbs, burrow is a hyponym of delve; that is, burrow is a word with a more specific, narrower meaning than delve:

Other hyponyms of delve include furrow, groove, rut, root, rootle, rout, spade, shovel, trowel, tunnel.

delve (noun)	burrow (noun)
	a hole made by an animal, usually for shelter

delve (verb)	burrow (verb)
turn up, loosen, or remove earth	move through by or as by digging