Ewing's tumour vs Canadian spelling

Ewing's tumour and Canadian spelling both are nouns.

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

Ewing's tumour (noun)	Canadian spelling (noun)
malignant tumor in bone marrow (usually in the pelvis or in long bones)	English orthography used in Canada (characterized by 'analyze', 'centre', 'useable')