ben vs mountain

ben and mountain both are nouns.

Word	Noun	Adjective	Verb	Adverb
ben	Yes	No	No	No
mountain	Yes	No	No	No

As nouns, mountain is a hypernym of ben; that is, mountain is a word with a broader meaning than ben:

ben: a mountain or tall hill
mountain: a land mass that projects well above its surroundings; higher than a hill

Other hypernyms of ben include mount.

ben (noun)	mountain (noun)
a mountain or tall hill	a land mass that projects well above its surroundings; higher than a hill
	(often followed by `of') a large number or amount or extent