| Coom (n.) Soot; coal dust; refuse matter, as the dirty grease which comes from axle boxes, or the refuse at the mouth of an oven. Thesaurus Entries alluvion, alluvium, ashes, brand, calx, carbon, charcoal, cinder, cinders, clinker, clinkers, coal, coals, coke, coom, deposition, deposits, diluvium, draff, dregs, dross, ember, embers, feces, froth, fume, fumes, grounds, lava, lees, loess, moraine, offscum, precipitate, precipitation, reek, scoria, scum, sediment, settlings, silt, sinter, slag, smoke, smudge, smut, soot, sublimate, sullage |