page - one side of one leaf (of a book or magasine or newspaper or letter etc.) or the written or pictorial matter it contains

side - an extended outer surface of an object; "he turned the box over to examine the bottom side"; "they painted all four sides of the house"

tail - (usually plural) the reverse side of a coin that does not bear the representation of a person's head

coin - a metal piece (usually a disc) used as money