favourite vs Australian spelling

favourite and Australian spelling both are nouns.

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

favourite (noun)	Australian spelling (noun)
something regarded with special favor or liking	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')
a special loved one
a competitor thought likely to win

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

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