Noun

• S: (n) sludge, slime, goo, goop, gook, guck, gunk, muck, ooze (any thick, viscous matter)
• S: (n) droppings, dung, muck (fecal matter of animals)

Verb

• S: (v) muck (remove muck, clear away muck, as in a mine)
• S: (v) manure, muck (spread manure, as for fertilization)
• S: (v) mire, muck, mud, muck up (soil with mud, muck, or mire) "The child mucked up his shirt while playing ball in the garden"