Ewing's tumour vs sarcoma

Ewing's tumour and sarcoma both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ewing's tumour	Yes	No	No	No
sarcoma	Yes	No	No	No

As nouns, sarcoma is a hypernym of Ewing's tumour; that is, sarcoma is a word with a broader meaning than Ewing's tumour:

Ewing's tumour: malignant tumor in bone marrow (usually in the pelvis or in long bones)
sarcoma: a usually malignant tumor arising from connective tissue (bone or muscle etc.); one of the four major types of cancer

Ewing's tumour (noun)	sarcoma (noun)
malignant tumor in bone marrow (usually in the pelvis or in long bones)	a usually malignant tumor arising from connective tissue (bone or muscle etc.); one of the four major types of cancer