Renaming a table is a simple task, however one thing most people miss is to find all table dependencies and replace the table in stored procedures/functions/views using that particular table. A T-SQL script to rename table is shown below
EXEC sp_rename 'Person.Address', 'Addresses';
The above query renames Person.Address to Addresses table. Refer to http://www.sqlservergeeks.com/find-dependencies-of-a-table-in-sql-server/ to find table dependencies and rename the table there too.
Any object can also be renamed using GUI. Navigate to the object to rename and click F2 to rename it.