cancer vs lymphoma

cancer and lymphoma both are nouns.

Word	Noun	Adjective	Verb	Adverb
cancer	Yes	No	No	No
lymphoma	Yes	No	No	No

As nouns, lymphoma is a hyponym of cancer; that is, lymphoma is a word with a more specific, narrower meaning than cancer:

cancer: any malignant growth or tumor caused by abnormal and uncontrolled cell division; it may spread to other parts of the body through the lymphatic system or the blood stream
lymphoma: a neoplasm of lymph tissue that is usually malignant; one of the four major types of cancer

Other hyponyms of cancer include carcinoma, cancer of the blood, leucaemia, leukaemia, leukemia, sarcoma.

cancer (noun)	lymphoma (noun)
any malignant growth or tumor caused by abnormal and uncontrolled cell division; it may spread to other parts of the body through the lymphatic system or the blood stream	a neoplasm of lymph tissue that is usually malignant; one of the four major types of cancer