What is the part called the the water pump is bolted t as there is a water leak between this and the engine block

 

Timing case cover

 

what is the process to repair this is it an easy fix?

 

Take it off and replace the gasket

 

a timing gasket kit should have the gaskets you need, including the water pump gasket.

 

Are you 100% sure it is coming from the timing case to block gasket?

I ask because if your going in that far you might as well replace the crank seal and the timing chain and gears (if it has many miles and or exhibits excessive slop).

Coolant can wick all over the place and fool you. Take a close look at other possible potential leak areas.

Step 1. Pressure test the system. This will take out all the guesswork.
Step 2. Make sure all of the fasteners on the pump and case are torqued to proper torque. Careful with the 3/8 headed bolts they require inch pounds and will easily strip.
Also, there is a double ended bolt or two that will require you to remove the nut and bracket and tighten the end threaded into the block. If you try to tighten the whole assembly you will over torque and risk snapping said bolt.