yellow ochre vs Australian spelling

yellow ochre and Australian spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
yellow ochre	Yes	No	No	No
Australian spelling	Yes	No	No	No

yellow ochre (noun)	Australian spelling (noun)
pigment consisting of a limonite mixed with clay and silica	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')