Fee simple and fee simple absolute are effectively interchangeable. Fee simple absolute is the type of ownership we've talked about throughout the article: complete, no-restrictions ownership of property. Almost all fee simple ownership in Canada is of the absolute variety.
There are other types, though, such as fee simple determinable. An example of this is the life estate, which we mentioned earlier. The inheritor of a life estate gets fee simple determinable ownership of that property. They have total ownership of the property and can do whatever they want, but when the inheritor dies the property reverts back to the party that originally granted the life estate (or their heirs).