moustache vs Australian spelling

moustache and Australian spelling both are nouns.

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

moustache (noun)	Australian spelling (noun)
an unshaved growth of hair on the upper lip	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')