TARS

noun

1. (usually uncountable) A black, oily, sticky, viscous substance, consisting mainly of hydrocarbons derived from organic materials such as wood, peat, or coal.
2. Coal tar.
3. A solid residual byproduct of tobacco smoke.

verb

1. To coat with tar.
2. To besmirch.

noun

1. A program for archiving files, common on Unix systems.
2. A file produced by such a program.