WordNet sense 1 (the quantity contained in a plate):

plateful

WordNet sense 2 (a rigid layer of the Earth's crust that is believed to drift slowly):

crustal plate

WordNet sense 3 (a flat sheet of metal or glass on which a photographic image can be recorded):

photographic plate

WordNet sense 4 (a shallow receptacle for collection in church):

collection plate

WordNet sense 5 (a metal sheathing of uniform thickness (such as the shield attached to an artillery piece to protect the gunners)):

scale, shell

WordNet sense 6 ((baseball) base consisting of a rubber slab where the batter stands; it must be touched by a base runner in order to score):

home, home plate, home base

WordNet sense 7 (a dental appliance that artificially replaces missing teeth):

denture, dental plate