Word+lists

List of Grade 4 ELA words
http://reading-sage.blogspot.com/2011/08/fourth-grade-reading-and-language-arts.html

High Frequency Tier 2 Words
http://reading-sage.blogspot.com/2011/08/high-frequency-academic-vocabulary.html

Science Vocabulary
http://reading-sage.blogspot.com/2011/09/4th-grade-science-academic-vocabulary.html

Greek and Latin Affixes
http://www.factmonster.com/ipka/A0907017.html