myeloma vs malignant neoplasm

myeloma and malignant neoplasm both are nouns.

Word	Noun	Adjective	Verb	Adverb
myeloma	Yes	No	No	No
malignant neoplasm	Yes	No	No	No

As nouns, malignant neoplasm is a hypernym of myeloma; that is, malignant neoplasm 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
malignant neoplasm: a tumor that is malignant and tends to spread to other parts of the body

Other hypernyms of myeloma include malignant tumor, metastatic tumor.

myeloma (noun)	malignant neoplasm (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