This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Any of various large, hairy, extinct elephants of the genus Mammuthus, especially the woolly mammoth.

n. Something of great size.

adj. Of enormous size; huge. See Synonyms at enormous.

n. A large, hairy, extinct elephant-like mammal of the taxonomic genus Mammuthus.

n. Something very large of its kind.

adj. Very large.

n. An extinct, hairy, maned elephant (Mammuthus primigenius formerly Elephas primigenius), of enormous size, remains of which are found in the northern parts of both continents. The last of the race, in Europe, were coeval with prehistoric man.

adj. Resembling the mammoth in size; very large; gigantic.

n. An extinct species of elephant, Elephas primigenius.

Of great comparative size, like a mammoth; gigantic; colossal; immense: as, a mammoth ox; the mammoth tree of California (Sequoia gigantea).

adj. so exceedingly large or extensive as to suggest a giant or mammoth

n. any of numerous extinct elephants widely distributed in the Pleistocene; extremely large with hairy coats and long upcurved tusks

"And suddenly the term mammoth, no longer just referring to an animal, meant anything big."

big    large   

mammoth tree   

gigantic    huge    colossal    titanic    enormous   

gigantic    colossal    monstrous    monumental    ponderous    good-sized    gargantuan    armored    cylindrical    near