sarcoma vs osteosarcoma

sarcoma and osteosarcoma both are nouns.

Word	Noun	Adjective	Verb	Adverb
sarcoma	Yes	No	No	No
osteosarcoma	Yes	No	No	No

As nouns, osteosarcoma is a hyponym of sarcoma; that is, osteosarcoma is a word with a more specific, narrower meaning than sarcoma:

sarcoma: a usually malignant tumor arising from connective tissue (bone or muscle etc.); one of the four major types of cancer
osteosarcoma: malignant bone tumor; most common in children and young adults where it tends to affect the femur

sarcoma (noun)	osteosarcoma (noun)
a usually malignant tumor arising from connective tissue (bone or muscle etc.); one of the four major types of cancer	malignant bone tumor; most common in children and young adults where it tends to affect the femur