Glickstein & Kennedy 
Crosswords and Wordsearches, Grades 2 – 4 [PDF ebook] 

The top-selling teacher resource line The 100+ Series(TM) features over 100 reproducible activities in each book! Crosswords and word searches have become popular means for teaching words, terms, and concepts. They’ve become popular for two reasons: they are enjoyable and they work. The topics in this collection cover the basic terms and concepts usually taught at the second through fourth grade level. The crossword and word search puzzles in this book cover a wide variety of subjects across the curriculum. A few examples of the topics included are vowel sounds, compound words, holidays, math terms, and astronomy terms.