carcinoid vs tumour

carcinoid and tumour both are nouns.

Word	Noun	Adjective	Verb	Adverb
carcinoid	Yes	No	No	No
tumour	Yes	No	No	No

As nouns, tumour is a hypernym of carcinoid; that is, tumour is a word with a broader meaning than carcinoid:

carcinoid: a small tumor (benign or malignant) arising from the mucosa of the gastrointestinal tract; usually associated with excessive secretion of serotonin
tumour: an abnormal new mass of tissue that serves no purpose

Other hypernyms of carcinoid include neoplasm, tumor.

carcinoid (noun)	tumour (noun)
a small tumor (benign or malignant) arising from the mucosa of the gastrointestinal tract; usually associated with excessive secretion of serotonin	an abnormal new mass of tissue that serves no purpose