It may be the same
A tumor is abnormal tissue that is growing in an area where it really shouldn't be found.
Tumors can be benign (such as meningiomas) or malignant (such as glioblastomas). People could use the term brain tumor
to refer to either of these disease. Brain cancer
would most often refer to only the malignant types of tumors or to cancer that metastasized to the brain from other sites in the body.