preferent vs favourite

preferent is not a noun while favourite is a noun.

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

As adjectives, preferent and favourite are synonyms defined as:

preferent and favourite: preferred above all others and treated with partiality

Other synonyms of preferent include best-loved, favored, favorite, favoured, pet, preferred.

preferent (noun)	favourite (noun)
	something regarded with special favor or liking
	a special loved one
	a competitor thought likely to win

preferent (adjective)	favourite (adjective)
preferred above all others and treated with partiality	preferred above all others and treated with partiality
	appealing to the general public

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