favourite vs British spelling

favourite and British spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
favourite	Yes	Yes	Yes	No
British spelling	Yes	No	No	No

favourite (noun)	British spelling (noun)
something regarded with special favor or liking	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')
a special loved one
a competitor thought likely to win

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

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