envy vs rancour

envy and rancour both are nouns.

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

As nouns, rancour is a hypernym of envy; that is, rancour is a word with a broader meaning than envy:

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

Other hypernyms of envy include bitterness, gall, rancor, resentment.

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

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