I'm trying to think of a good name to refer to a specific class of limb that belongs to a creature. The best I can come up with is "Weapon", but that assumes the force is particularly strong when applied, and gentle pushing and pulling forces are quite possible.

A "whatsit" can do the following:
* Apply a force consisting of a push against a target.
Example: a dolphin's tail, a boxer's arm and gloved fist

A "Motivator" can do the following:
* Apply a force consisting of a push against a target.
* Support a being's weight.
Example: a leg

A "Gripper" can do the following:
* Apply a force consisting of a push against a target.
* Attach to a target.
* Apply a force consisting of a pull against a target.
* Support a being's weight.
Example: a dog's mouth

A "Manipulator" can do the following:
* Apply a force consisting of a push against a target.
* Attach to a target.
* Apply a force consisting of a pull against a target.
* Move and rotate a target along all six axes in order to position it in a certain way.
* Place a target in a specific fashion in a location or against another target.
* Support a being's weight.
Example: a human arm with ungloved hand


For instance, a human has two Motivators and two Manipulators. The human's Motivators are its feet. It can support its weight on its feet, or on its arms if it needs to, and can use its feet to push open doors or kick them down. Its Manipulators are its arms... it can use tools, pull open doors, push doors shut, throw objects, lift items, put items on, etc.

Do you have any good names for the "whatsit"? A whatsit is basically something that can push or push with explosive force -- like a dolphin's tail or a balled fist that has been wrapped in a boxing glove.