sp_rename

Changes the name of a user-created object (i.e. table, column, or user-defined data type) in the current database.

Rename a table
This example renames the customers table to custs.

EXEC sp_rename 'customers', 'custs'

Rename a column
This example renames the contact title column in the customers table to title.

EXEC sp_rename 'customers.[contact title]', 'title', 'COLUMN'