Australian spelling vs Ewing's tumour

Australian spelling and Ewing's tumour both are nouns.

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

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