If you have finished high school level, I think you can try Giancoli Physics (algebra version)
and Zumdahl Chemistry. If you have learned calculus, you can try fundamentals of physics by halliday/resnick/walker (or any other versions of that book).
Those are recommended by a lot of people I believe, and I am using Giancoli myself and it is a good book.
Oh wait, reading back on your post, I am not sure if it will broaden your vocabulary per say,,,,
You can always read about other scientists and read the history of physics. That can give you some ideas on how physics and chemistry have progressed. I felt I learned a lot by reading books about Newton/einstein/faraday and so forth.