WordWeb Online

1. A land mass that projects well above its surroundings; higher than a hill
   - mount
    
2. (often followed by 'of') a large number, amount or extent
   "a mountain of letters";
   - batch, deal, flock, good deal, great deal, hatful, heap, lot, mass, mess, mickle [archaic], mint, muckle, passel [US], peck, pile [informal], plenty, pot, quite a little, raft, sight, slew, spate, stack, tidy sum, wad, bunch [informal]

Derived forms: mountains

Type of: elevation, large indefinite amount, large indefinite quantity, natural elevation

Encyclopedia: Mountain, Pt 1