Is a bone cyst considered a cancer or a tumor?

Bone cyst: Cyst is usually consider benign.

Depends: It depends on the type of bone cyst.

Usually not: Most bone cysts are benign. Malignant bone tumors usually cause bone destruction and periosteal reaction on bone x-ray.

Nomenclature: All cancers are tumors, but benign tumors are the opposite of malignant tumors / cancers. The familiar (mismamed) "bone cysts" are benign; there's some disagreement among pathologists whether they are even tumors.