Research shows that with learning the following 37 word endings, you can increase your early reader's vocabulary by 500 words.

ack	all	ain	ake	ake	ame	an	ank	ap	at
ate	aw	ay	ell	est	ice	ick	ight	ill	in
ine	ink	ip	ir 	ock	op	ore	or	uck	ump
unk	ale	ash	eat	ide	ing	oke	uge