envy vs rancor

envy and rancor both are nouns.

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

As nouns, rancor is a hypernym of envy; that is, rancor 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
rancor: a feeling of deep and bitter anger and ill-will

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

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