Noun scum has 2 senses
  1. trash, scum - worthless people
    --1 is a kind of rabble, riffraff, ragtag, ragtag and bobtail
  2. scum - a film of impurities or vegetation that can form on the surface of a liquid
    --2 is a kind of
    film
    --2 has particulars: slag, scoria, dross
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