e·co·no·box 
(ĭ-kŏnō-bŏks′)
(ĭ-kŏnō-bŏks′)n.
A small, economical automobile with few amenities.
[ECONO(MICAL) + BOX.]
- superconductivity
- superconductor
- supercontinent
- supercool
- supercritical fluid
- supercurrent
- superdelegate
- superdense
- superdominant
- superduper
- superego
- supereminence
- supereminent
- supereminently
- supererogate
- supererogation
- supererogative
- supererogatory
- superfamily
- superfast
- super featherweight
- superfecta
- superfecundation
- superfetate
- superfetation