Ok...in your version...the third 'gry' word would be .
In this version the third 'gry' word is hungry..... "There are three words in the English language that end with "gry." One is hungry and the other is . What is the third word? Everyone uses this word every day, everyone knows what it means, and knows what it stands for. If you have listened very closely I have already told you the third word."
So, there is your answer. After all, it is a riddle!
The riddle asks what the 3rd word is. The 3rd word is hungry or .
I underlined the pertinent parts of the riddle.
If you don't get it, that's ok. I don't get most of them.