Carcinoma and Liver cancer

Carcinoma noun - Any malignant tumor derived from epithelial tissue; one of the four major types of cancer.

Liver cancer and carcinoma are semantically related. In some cases you can replace phrase "Liver cancer" with "Carcinoma", this terms are similar.

Liver cancer noun - Malignant neoplastic disease of the liver usually occurring as a metastasis from another cancer; symptoms include loss of appetite and weakness and bloating and jaundice and upper abdominal discomfort.

Carcinoma and liver cancer are semantically related. You can use "Carcinoma" instead a noun phrase "Liver cancer".