melanoma vs malignant melanoma

melanoma and malignant melanoma both are nouns.

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

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

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

melanoma (noun)	malignant 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