Malignant melanoma and Skin cancer

Malignant melanoma noun - Any of several malignant neoplasms (usually of the skin) consisting of melanocytes.

Skin cancer and malignant melanoma are semantically related. In some cases you can use "Skin cancer" instead a noun phrase "Malignant melanoma".

Skin cancer noun - A malignant neoplasm of the skin.

Malignant melanoma and skin cancer are semantically related. Sometimes you can replace phrase "Malignant melanoma" with "Skin cancer", this phrases are similar.