myeloma vs metastatic tumor

myeloma and metastatic tumor both are nouns.

Word	Noun	Adjective	Verb	Adverb
myeloma	Yes	No	No	No
metastatic tumor	Yes	No	No	No

As nouns, metastatic tumor is a hypernym of myeloma; that is, metastatic tumor is a word with a broader meaning than myeloma:

myeloma: a tumor of the bone marrow (usually malignant) composed of cells normally found in bone marrow
metastatic tumor: a tumor that is malignant and tends to spread to other parts of the body

Other hypernyms of myeloma include malignant neoplasm, malignant tumor.

myeloma (noun)	metastatic tumor (noun)
a tumor of the bone marrow (usually malignant) composed of cells normally found in bone marrow	a tumor that is malignant and tends to spread to other parts of the body