osteochondroma vs benign tumour

osteochondroma and benign tumour both are nouns.

Word	Noun	Adjective	Verb	Adverb
osteochondroma	Yes	No	No	No
benign tumour	Yes	No	No	No

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

osteochondroma: benign tumor containing both bone and cartilage; usually occurs near the end of a long bone
benign tumour: a tumor that is not cancerous

Other hypernyms of osteochondroma include benign tumor, nonmalignant neoplasm, nonmalignant tumor, nonmalignant tumour.

osteochondroma (noun)	benign tumour (noun)
benign tumor containing both bone and cartilage; usually occurs near the end of a long bone	a tumor that is not cancerous