Irritating word puzzle.

My mother is the recipient of the old "There are three words in the
Enlgish language that end in "gry", one is angry one is hungry..."
word puzzle.  As far as I'm concerned the third word is gry (means
rage or roar), but that's because I'm not too imaginative when it
comes to word puzzles.  Does any one of us know what the "right"
answer is?  She and a couple of friends have been trying to sort it
out for a week or so, but I'd like to put the thing out of its misery.

Gryingly yours,
Padraic.