http://www.manhattangmat.com/forums/sho ... -t426.html
check it out and post back if you have any other questions.
in general, generic questions about the use of common words (such as this question) can be much better answered by a quick search online. number one, you'll find immediate feedback (we're more than a bit backlogged at the moment, as you can see), and, number two, you'll find much more detail than we could hope to post here.