What part of the world are you from? I ask because this is the first that I've heard that `greater` and `grader` are pronounced the same and now I am curious what country you are in.
For everything in this list, there is at least one word that is not pronounced the same as the other two.
> greater grater grader
> baron barren bearing
> grisly grizzly gristly
> pedal peddle petal
> I also put since with cense, cents, scents, sense
> steal steel still
> peal peel pill