Common Words:
* Angry
* Busy
* Hungry
* Sleepy
* Ugly
* Dirty
* Easy
* Heavy
* Happy
* Funny
* Sappy
* Dizzy
* Crazy
Less Common Words:
* Fizzy
* Foggy
* Lumpy
* Soggy
* Slobby
* Spiky
* Sticky
* Wavy
* Bumpy
* Craggy
* Slimy
* Cloudy
* Chubby
* Dumpy
* Scruffy
Words with Specialized Meanings:
* Lithography (a printing process)
* Photography (the art of taking pictures)
* Strategy (a plan of action)
* Energy (the power to do work)
This is not an exhaustive list, but it gives you a good starting point for words ending in "gy".