rankle vs nettle

rankle is not a noun while nettle is a noun.

Word	Noun	Adjective	Verb	Adverb
rankle	No	No	Yes	No
nettle	Yes	No	Yes	No

As verbs, nettle is a hypernym of rankle; that is, nettle is a word with a broader meaning than rankle:

Other hypernyms of rankle include annoy, bother, chafe, devil, get at, get to, gravel, irritate, nark, rag, rile, vex.

rankle (noun)	nettle (noun)
	any of numerous plants having stinging hairs that cause skin irritation on contact (especially of the genus Urtica or family Urticaceae)

rankle (verb)	nettle (verb)
gnaw into; make resentful or angry	cause annoyance in; disturb, especially by minor irritations
	sting with or as with nettles and cause a stinging pain or sensation