Check out some of these links!

Fact Monster:

http://www.factmonster.com/ipka/A0882902.html

Fun Brain

http://www.funbrain.com/roots/index.html

Dictionary Fun

http://www.yourdictionary.com/fun.html

Nouns Review

http://www.quia.com/cb/28126.html

Noun Dunk

http://www.harcourtschool.com/activity/basketball/index.html

Singular and Plural Nouns

http://www.quia.com/jg/333551.html

Grammar Ninja

http://www.english-online.org.uk/games/verbnounboth.htm

Grammar Games

http://www.sheppardsoftware.com/web_games_vocab.htm

Verbs

http://www.softschools.com/language_arts/grammar/verb/balloon_game/