lung cancer vs carcinoma

lung cancer and carcinoma both are nouns.

Word	Noun	Adjective	Verb	Adverb
lung cancer	Yes	No	No	No
carcinoma	Yes	No	No	No

As nouns, carcinoma is a hypernym of lung cancer; that is, carcinoma is a word with a broader meaning than lung cancer:

lung cancer: carcinoma of the lungs; one of the commonest forms of cancer
carcinoma: any malignant tumor derived from epithelial tissue; one of the four major types of cancer

lung cancer (noun)	carcinoma (noun)
carcinoma of the lungs; one of the commonest forms of cancer	any malignant tumor derived from epithelial tissue; one of the four major types of cancer