look up to vs envy

look up to is not a noun while envy is a noun.

Word	Noun	Adjective	Verb	Adverb
look up to	No	No	Yes	No
envy	Yes	No	Yes	No

As verbs, envy is a hyponym of look up to; that is, envy is a word with a more specific, narrower meaning than look up to:

look up to (noun)	envy (noun)
	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

look up to (verb)	envy (verb)
feel admiration for	be envious of; set one's heart on
	feel envious towards; admire enviously