malignant melanoma vs melanoma

malignant melanoma and melanoma both are nouns.

Word	Noun	Adjective	Verb	Adverb
malignant melanoma	Yes	No	No	No
melanoma	Yes	No	No	No

As nouns, malignant melanoma and melanoma are synonyms defined as:

malignant melanoma and melanoma: any of several malignant neoplasms (usually of the skin) consisting of melanocytes

malignant melanoma (noun)	melanoma (noun)
any of several malignant neoplasms (usually of the skin) consisting of melanocytes	any of several malignant neoplasms (usually of the skin) consisting of melanocytes