read books - not too recent ones either; dramas, plays (Shakespeare), westerns; read a thesaurus - not kidding. when you draft prose, such as a letter or even an email, try new words - one or two here and there; do crossword puzzles!; and most importantly: once you have increased your vocabulary and are utilizing it, do not stop to make folks with lesser feel better. make them come up a level rather than you dropping one.