angiosarcoma vs malignant tumor

angiosarcoma and malignant tumor both are nouns.

Word	Noun	Adjective	Verb	Adverb
angiosarcoma	Yes	No	No	No
malignant tumor	Yes	No	No	No

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

angiosarcoma: a rare malignant neoplasm arising from vascular tissue; usually occurs in the breast and skin and is believed to originate from the endothelial cells of blood vessels
malignant tumor: a tumor that is malignant and tends to spread to other parts of the body

Other hypernyms of angiosarcoma include malignant neoplasm, metastatic tumor.

angiosarcoma (noun)	malignant tumor (noun)
a rare malignant neoplasm arising from vascular tissue; usually occurs in the breast and skin and is believed to originate from the endothelial cells of blood vessels	a tumor that is malignant and tends to spread to other parts of the body