signalling vs Australian spelling

signalling and Australian spelling both are nouns.

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

signalling (noun)	Australian spelling (noun)
any nonverbal action or gesture that encodes a message	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')