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They are used in the same applications as fender washers. A spherical washer is part of a self-aligning nut; it is a washer with one radiused surface, which is designed to be used in conjunction with a mating nut in order to correct for up to several degrees of misalignment between parts.
Rubber gaskets used in plumbing are sometimes called washers. Different types of washers have different uses. Star washers are helpful when the material is soft enough to allow the washer to adhere. Flat washers are used to disburse the compression of the nut or bolt smoothly. This lessens the possibility of damage and offers a flat space for the nut or bolt to stay, meaning it will be more likely to stay in one place.