delve vs furrow

delve is not a noun while furrow is a noun.

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

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

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

delve (noun)	furrow (noun)
	a long shallow trench in the ground (especially one made by a plow)
	a slight depression or fold in the smoothness of a surface

delve (verb)	furrow (verb)
turn up, loosen, or remove earth	hollow out in the form of a furrow or groove
	make wrinkled or creased
	cut a furrow into a columns