Single words are best.
In the spirit of this site being a gateway resource these links are here for you to use. This is a handy desktop utility for finding the definations of any word. Teaching is difficult, and more so for volunteers. This Teaching Handbook will give you positive and direct instructions for teaching students, an Ohio State Univ. The purpose of this link, is to provide a method for the structuring of classes, and to help the lay-teacher by providing a tool set for the conduct of classes.