rancour vs resentment

rancour and resentment both are nouns.

Word	Noun	Adjective	Verb	Adverb
rancour	Yes	No	No	No
resentment	Yes	No	No	No

As nouns, rancour and resentment are synonyms defined as:

Other synonyms of rancour include bitterness, gall, rancor.

rancour (noun)	resentment (noun)
a feeling of deep and bitter anger and ill-will	a feeling of deep and bitter anger and ill-will