The noun mountain has 2 senses (first 1 from tagged texts)
1. (17) mountain, mount -- (a land mass that projects well above its surroundings; higher than a hill)
2. tons, dozens, heaps, lots, mountain, piles, scores, stacks, loads, rafts, slews, wads, oodles, gobs, scads, lashings -- (a large number or amount; "made lots of new friends"; "she amassed a mountain of newspapers")