Another word starting with g is gloominess
global
grate, grill
Grown up
ghoul
gnashing
gospel
Maybe Gratis is a word that would work.
Glitterati
A beverage starting with the letter "g" can be Gatorade... or if you found another answer, then great.
geyser
Gazelle
Another 'g' word for gadget is gizmo or gismo.