osteoblastoma vs benign tumor

osteoblastoma and benign tumor both are nouns.

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

As nouns, benign tumor is a hypernym of osteoblastoma; that is, benign tumor 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 tumor: a tumor that is not cancerous

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

osteoblastoma (noun)	benign tumor (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