gear·head 
(gîrhĕd′)
(gîrhĕd′)n.
Slang
Slang
One who is knowledgeable or enthusiastic about the equipment and functioning of mechanical devices, especially automobiles.
- supercharge
- supercharged
- supercharger
- superciliary
- supercilious
- superciliously
- superciliousness
- superclass
- supercluster
- supercoil
- supercollider
- supercolony
- supercomputer
- superconduct
- superconducting
- superconductive
- superconductivity
- superconductor
- supercontinent
- supercool
- supercritical fluid
- supercurrent
- superdelegate
- superdense
- superdominant