cancer of the blood vs leukaemia

cancer of the blood and leukaemia both are nouns.

Word	Noun	Adjective	Verb	Adverb
cancer of the blood	Yes	No	No	No
leukaemia	Yes	No	No	No

As nouns, cancer of the blood and leukaemia are synonyms defined as:

cancer of the blood and leukaemia: malignant neoplasm of blood-forming tissues; characterized by abnormal proliferation of leukocytes; one of the four major types of cancer

Other synonyms of cancer of the blood include leucaemia, leukemia.

cancer of the blood (noun)	leukaemia (noun)
malignant neoplasm of blood-forming tissues; characterized by abnormal proliferation of leukocytes; one of the four major types of cancer	malignant neoplasm of blood-forming tissues; characterized by abnormal proliferation of leukocytes; one of the four major types of cancer