osteoblastoma vs benign tumour

osteoblastoma and benign tumour both are nouns.

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

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

osteoblastoma: benign tumor of bone and fibrous tissue; occurs in the vertebrae or femur or tibia or arm bones (especially in young adults)
benign tumour: a tumor that is not cancerous

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

osteoblastoma (noun)	benign tumour (noun)
benign tumor of bone and fibrous tissue; occurs in the vertebrae or femur or tibia or arm bones (especially in young adults)	a tumor that is not cancerous