This is just about my favorite trick in Words With Friends. If you have an S, try to use it for two purposes. First, to extend one of your words to its plural tense in order to gain a double or triple word score, or, even better, use it to pluralize one of your opponent’s words, and build a new word with it. If the word you’re building off of has quality letters in it, you get those points, plus the points for your new word, which is obvious. What may not be obvious is that this tactic can also cut into any major gains your opponent received from double word or triple letter scores, as you are getting all the ‘base’ points for your opponent’s word and then gaining points of your own, turning their epic play into just another word.