a wood ceiling is simply that. a ceiling made from wood. it can be sheets of wood or planks. a board ceiling is made from drywall and is a bit harder to do. a suspended ceiling is made using metal strips shaped like a "T" . they are put up using wire to suspend them and then panels are installed between the metal strips. it's kind of hard to explain but most malls have suspended ceilings so you can always look at one to get a better idea. i hope this helps. suspended ceilings give you the benefit of being able to remove panels to do work such as wiring and plumbing without having to repair the ceiling when you are done.