columbian mammoth vs mammoth

columbian mammoth and mammoth both are nouns.

Word	Noun	Adjective	Verb	Adverb
columbian mammoth	Yes	No	No	No
mammoth	Yes	Yes	No	No

As nouns, mammoth is a hypernym of columbian mammoth; that is, mammoth is a word with a broader meaning than columbian mammoth:

columbian mammoth: a variety of mammoth
mammoth: any of numerous extinct elephants widely distributed in the Pleistocene; extremely large with hairy coats and long upcurved tusks

columbian mammoth (noun)	mammoth (noun)
a variety of mammoth	any of numerous extinct elephants widely distributed in the Pleistocene; extremely large with hairy coats and long upcurved tusks

columbian mammoth (adjective)	mammoth (adjective)
	so exceedingly large or extensive as to suggest a giant or mammoth