WordNet sense 1 (a state of confusion and disorderliness):

messiness, muss, mussiness

WordNet sense 2 (informal terms for a difficult situation):

fix, hole, jam, muddle, pickle, kettle of fish

WordNet sense 3 ((often followed by `of') a large number or amount or extent):

batch, deal, flock, heap, lot, mass, mint, peck, pile, plenty, pot, raft, sight, slew, spate, stack, wad, hatful, mickle, muckle, good deal, great deal, quite a little, tidy sum, whole lot, whole slew

WordNet sense 4 (a (large) military dining room where service personnel eat or relax):

mess hall