OVER HEATING AFTER REPLACING WATER PUMP

You need to be sure that your coolant level is correct. Here is a procedure to get it full.
Fill the reservoir and radiator (if possible) then start the car and let it run for a min. Then turn it off and refill the coolant. Start the car and let it get hot (but not overheating) then let it cool and refill the coolant.
You have to do this procedure in order to get all the air out. You might also have a bleed valve on the thermostat housing that you can open to bleed the air.
This is the most likely cause of your problem.

That's great. I know of a lot of mechanics who don't know this trick. I'm glad it worked for you!