rimes and rhymes

I don't know what I would do without the web site wordsmith.org.  I use it constantly to plan Making Words lessons.  Click on "anagram" on their homepage.  Then, just insert a big word that correlates with your theme and the site will tell you all of the word arrangement possibilities for that word.  For example, the word "investigate," a good science word, has over 1,600 little words that can be made by those 11 letters!