This word chums cheat tool helps find the words you can build from your letters. Enter your letters in the top box and hit the "get words" button. Use ? or * for blank tiles. This updates the list of possible words in the solver. Possible words are displayed in the order of their point scored.
Since word chums requires you to build off letters on the board, use the second row of boxes to figure out where you can fit your word on the word chums board. For example, use the "starts with" box to build off the end of an existing word. Along the same lines, you can use "ends with" to add letters in front of a word on the board. If you want to build across an existing word, using only one letter from that word, try the "includes letter" box. If you enter multiple letters in the include letter box, the solver assumes it can only use one of them. This is helpful late in the game where you are trying to fit letters into a tight spot.
The word chums cheat tool give you the words that it identified. These are sorted by size and strategic value. Use the arrows to page back and forth through the possible words. When you're working with the list, watch out for chances to play off bonus tiles on the board. These can improve your score.