Australian spelling vs signalling

Australian spelling and signalling both are nouns.

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

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