Ewing's tumor vs endothelial myeloma

Ewing's tumor and endothelial myeloma both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ewing's tumor	Yes	No	No	No
endothelial myeloma	Yes	No	No	No

As nouns, Ewing's tumor and endothelial myeloma are synonyms defined as:

Ewing's tumor and endothelial myeloma: malignant tumor in bone marrow (usually in the pelvis or in long bones)

Other synonyms of Ewing's tumor include Ewing's sarcoma, Ewing's tumour.

Ewing's tumor (noun)	endothelial myeloma (noun)
malignant tumor in bone marrow (usually in the pelvis or in long bones)	malignant tumor in bone marrow (usually in the pelvis or in long bones)