Coom is a word that has a variety of meanings, from a deep, narrow valley to the dust and fine particles that accumulate in the corners and crevices of a room. If you're looking for synonyms for this versatile word, there are a few options. For the geological definition, try words like ravine, gorge, or gully. If you're referring to the dust and debris that accumulates in a space, tricky words like filth, grime, or debris will do the trick. When using coom to describe a person, you might consider alternatives like a rogue, scoundrel, or even a rascal.