Prefixes and suffixes are a critical part of the game. A simple example of this is turning PLAY into PLAYING. I’ve found an interesting list taken from How to Play SCRABBLE Like a Champion.
I’ve adapted and modified for the words with friends dictionary: BEBLOOD, BECHALK, BEDIAPER, BEFINGER, BEUNCLED, DENUDER, ENDAMAGE, MISMEET, MISTRYST, NONEGO, OUTCHIDE, OUTECHO, OUTFROWN, OUTGNAW, OUTHOWL, OUTPLOD, OUTSNORE, OUTSULK, OUTYELP, OVERCOY, OVERFAT, OVERFOUL, OVERHOLY, OVERMEEK, OVERPERT, OVERSUP, SEMIHOBO, SUBSHRUB, TAKEABLE, GIVEABLE, DOGDOM, MOVIEDOM, SODALESS, LORNNESS. See if you can add one of these to your game today!