Still not sure which word to use? Choose a picture and take a look through the many choices! This graphic has excellent pictures to go with the information and I think that really help gets the point across.
A review of the basics is always beneficial. This poster, created by the folks at www.knowledgeunlimited.com, measures 18- by 25-inches. You can order it for just under 15 dollars at http://www.thekustore.com/kucatalog.cgi/7124P