rancour vs envy

rancour and envy both are nouns.

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

As nouns, envy is a hyponym of rancour; that is, envy is a word with a more specific, narrower meaning than rancour:

rancour: a feeling of deep and bitter anger and ill-will
envy: a feeling of grudging admiration and desire to have something that is possessed by another

Other hyponyms of rancour include heartburning, huffishness, sulkiness, grievance, grudge, score, enviousness.

rancour (noun)	envy (noun)
a feeling of deep and bitter anger and ill-will	spite and resentment at seeing the success of another (personified as one of the deadly sins)
	a feeling of grudging admiration and desire to have something that is possessed by another

rancour (verb)	envy (verb)
	be envious of; set one's heart on
	feel envious towards; admire enviously