One who would remove social inequalities or distinctions; a socialist.

a radical who advocates the abolition of political or economic or social inequalities

A device used on a hanging lamp to keep the lamp hanging level. Often a spreader that pivots in the center.

A long, round, pillow like device that rests on the vehicle seat to even out the car seat and prevent it from leaning to far one way.

a dynamics processor that maintains (levels) the amount of one audio signal based upon the level of a second audio signal

One who, or that which, levels.