Synonyms of the word

scoria

• n. The slag or dross that remains after the smelting of metal from an ore.
• n. (geology) Rough masses of rock formed by solidified lava, and which can be found around a volcano's crater.

dross

• n. Waste or impure matter.
• n. Worthless or trivial matter.
• n. Residue that forms on the surface of a metal from oxidation.
• n. The impurities in metal.
• n. A waste product from working with metal.
• v. (transitive) To remove dross from.

scum

• n. (uncountable) A layer of impurities that accumulates at the surface of a liquid (especially molten metal…
• n. (uncountable) A greenish water vegetation (such as algae), usually found floating on the surface of ponds.
• n. The topmost liquid layer of a cesspool or septic tank.
• n. (uncountable, slang, chiefly US) semen.
• n. (countable, derogatory, slang) A reprehensible person or persons.
• v. To remove the layer of scum from (a liquid etc.).
• v. To remove (something) as scum.
• v. To become covered with scum.
• v. (obsolete) To scour (the land, sea etc.).
• v. (obsolete) To gather together, as scum.
• v. (video games, informal) To startscum or savescum.

slag

• n. Waste material from a coal mine.
• n. Scum that forms on the surface of molten metal.
• n. Impurities formed and separated out when a metal is smelted from ore; vitrified cinders.
• n. Hard aggregate remaining as a residue from blast furnaces, sometimes used as a surfacing material.
• n. Scoria associated with a volcano.
• n. (Britain, pejorative, dated) A coward.
• n. (Britain, chiefly Cockney, pejorative) A contemptible person, a scumbag.
• n. (Britain, pejorative) A prostitute.
• n. (Britain, Australia, New Zealand, slang, pejorative) A woman (sometimes a man) who has loose morals relating…
• v. (transitive) To produce slag.
• v. (intransitive) To become slag; to agglomerate when heated below the fusion point.
• v. (transitive, with "off") To talk badly about; to malign or denigrate (someone).
• v. (intransitive, Australia, slang) To spit.