Anterior cervical corpectomy and fusion versus anterior cervical discectomy and fusion, what's the difference? dr said he was going to remove the disks at c4-7 and insert a cage and "fake" bone along with some of my bone and then plate on the front?

Anterior cervical corpectomy requires removing nearly the entire vertebral body and disc in order to correct the spinal stenosis and myelopathy. So the procedure you will have it done is the latter, anterior cervical discectomy and fusion.

A discectomy and fusion is appropriate when the spinal canal stenosis or nerve compression is more limited to the disc space. A corpectomy is considered when there is severe spinal cord compression that extends beyond the disc space and especially with calcium deposition known as OPLL. With more than two disc spaces a 2nd stage posterior instrumentation may be needed, instead of the anterior plate