No, a seesaw is an example of a "lever".
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Wedge
Whether or not a mill is an example of a wheel and axle is a matter of semantics. It certainly would contain examples of a wheel and axle.
A classic example of a wheel and axle is a bicycle. The wheel rotates around the axle, allowing the bike to move forward efficiently. Another example is a screwdriver, where turning the handle (wheel) rotates the rod (axle) to drive a screw into a surface.
You could say a bike wheel is a wheel and axle. Also a doorknob is a wheel and axle.
A cycle
A tire
a doorknob
Can opener
yes of course
No, a pencil is an object used to apply carbon lead to writing materials.