Earlier quoted context omitted.
So according to your link and yourself, a graduate degree may encompass both master's and doctoral degrees, which would only serve to obscure the meaning. Also, I don't think you intended it to be this way, but your inclusion of the pronunciation comes off as condescending.
I only included the pronunciation because you used a version of "graduate" in your original comment that has a different pronunciation and different meaning. (gra-jə-wāt vs. gra-jə-wət) > a graduate degree may encompass both master's and doctoral degrees, which would only serve to obscure the meaning. Nope, 99% of the time "graduate degree" == "master's degree". Usually "postgraduate degree" is used to refer to docto…
You should really learn about linguistic morphology.