Ewing's tumour vs Australian spelling

Ewing's tumour and Australian spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ewing's tumour	Yes	No	No	No
Australian spelling	Yes	No	No	No

Ewing's tumour (noun)	Australian spelling (noun)
malignant tumor in bone marrow (usually in the pelvis or in long bones)	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')