Read everything. Enrich your vocabulary skills by reading other people's words, which includes everything from the back of food boxes to the free pamphlets delivered in the mail. Fill your mind with words and phrases chosen by someone else.
Look up unfamiliar words and learn not only the definition, but also the synonyms of that word. Get a full understanding of the word and how you can use it -- and its alternatives -- in sentences.
Play word games, such as crosswords and word searches, or utilize one of the thousands of word games online that are designed to test and expand your vocabulary skills.
Read poetry and song lyrics. Poetry and songs use lyrical, rhythmic and often unusual words and phrases, which can expose you to new vocabulary.
Watch documentaries and read books on unfamiliar subjects. The new terminology will add weight to your vocabulary.