Australian spelling vs mum

Australian spelling and mum both are nouns.

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

Australian spelling (noun)	mum (noun)
English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')	secrecy
	informal terms for a mother
	of China

Australian spelling (adjective)	mum (adjective)
	failing to speak or communicate etc when expected to