malignant tumor vs metastatic tumor

malignant tumor and metastatic tumor both are nouns.

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

As nouns, malignant tumor and metastatic tumor are synonyms defined as:

malignant tumor and metastatic tumor: a tumor that is malignant and tends to spread to other parts of the body

Other synonyms of malignant tumor include malignant neoplasm.

malignant tumor (noun)	metastatic tumor (noun)
a tumor that is malignant and tends to spread to other parts of the body	a tumor that is malignant and tends to spread to other parts of the body