beginner — A beginner is someone who has just started learning to do something and cannot do it very well yet.
constructor — A racing car constructor or aircraft constructor is a company that builds racing cars or aircraft.
framer — a border or case for enclosing a picture, mirror, etc.
generator — a machine that converts one form of energy into another, especially mechanical energy into electrical energy, as a dynamo, or electrical energy into sound, as an acoustic generator.
prime mover — Mechanics. the initial agent, as wind or electricity, that puts a machine in motion. a machine, as a water wheel or steam engine, that receives and modifies energy as supplied by some natural source.