I hate to sound like a broken record, but my favorite way to teach vocabulary, just like most everyone else, is through BOOKS! Picture books, chapter books, books on the iPads, nonfiction books, etc. The possibilities are endless, and the book Bringing Words To Life is my go-to resource for using lots of strategies to help students acquire more Teir 2 words in to their vocabulary (a shout-out here to Jenn Alcorn for recommending this book on her blog).
I also like to use Super Duper Vocabulary Chipper Chat for teaching analogies, synonyms, antonyms, multiple meaning, etc through drills. The card decks that come with this set are frequently pulled out each day and used with lots of other "non-speech" games.
And my new favorite activity is from Speech Corner. Pick Your Points is a game where you get to set up categories and levels of questions using removable magnets on a whiteboard. Read more about the game here: http://www.speechcorner.com/language/pick-your-points-language.html
Students can answer questions about:
In addition, there are also categories for grammar and wh- questions as well, so it is an easy tool that can be used to address multiple types of language goals (and my artic kids love to use their good sounds to answer questions as well).
What are you using in your speech room?