srub

As a symbol rub

is russian rouble.

As a noun srub is

(a drink of fruit juice, spirits, etc).

As nouns the difference between scrub and srub

is that scrub is one who labors hard and lives meanly; a mean fellow or scrub can be an instance of scrubbing while srub is (a drink of fruit juice, spirits, etc).

As an adjective scrub

is mean; dirty; contemptible; scrubby.

As a verb scrub

is to rub hard; to wash with rubbing; usually, to rub with a wet brush, or with something coarse or rough, for the purpose of cleaning or brightening; as, to scrub a floor, a doorplate.