scrum

As nouns the difference between scum and scrum

is that scum is a layer of impurities that accumulates at the surface of a liquid (especially molten metal or water) while scrum is a tightly-packed and disorderly crowd of people.

As a verb scum

is to remove the layer of scum from (a liquid etc.).

In lang=en terms the difference between scrub and scrum

is that scrub is to move a recording tape back and forth with a scrubbing-like motion to produce a scratching sound, or to do so by a similar use of a control on an editing system while scrum is (all the forwards joined together in an organised way) In rugby union or rugby league, all the forwards joined together in an organised way. Also known as a scrummage.

As nouns the difference between scrub and scrum

is that scrub is one who labors hard and lives meanly; a mean fellow while scrum is a tightly-packed and disorderly crowd of people.

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.