favourite vs preferent

favourite is a noun but preferent is not a noun.

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

As adjectives, favourite and preferent are synonyms defined as:

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

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

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

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

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