Basically, the term wax generally means that the product contains carnuba, while polishes generally don't. Both are intended to protect the finish from atmospheric conditions, and UV damage. On a boat such as yours, with it's age and a high percentage of paint, I wouldn't worry about it, but on a new boat, with a majority of white gelcoat, you want to avoid the use of carnuba because it will yellow the gel badly.
"glaze", generally speaking is a final shine type of product, that is usually water soluble, and provides that last little bit of killer shine on a surface that is already highly polished. It usually will disappear after it get's wet. Many glazes also contain a very very fine abrasive to aid in the removal of swirl marks.
Hope this answers your questions....