choice vs favourite

choice and favourite both are nouns.

Word	Noun	Adjective	Verb	Adverb
choice	Yes	Yes	No	No
favourite	Yes	Yes	Yes	No

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

Other hyponyms of choice include pleasure, favorite, way.

choice (noun)	favourite (noun)
the act of choosing or selecting	something regarded with special favor or liking
the person or thing chosen or selected	a special loved one
one of a number of things from which only one can be chosen	a competitor thought likely to win

choice (adjective)	favourite (adjective)
of superior grade	preferred above all others and treated with partiality
appealing to refined taste	appealing to the general public

choice (verb)	favourite (verb)
	To mark an item as a personal favorite on social media