mound vs molehill

mound and molehill both are nouns.

Word	Noun	Adjective	Verb	Adverb
mound	Yes	No	Yes	No
molehill	Yes	No	No	No

As nouns, molehill is a hyponym of mound; that is, molehill is a word with a more specific, narrower meaning than mound:

Other hyponyms of mound include anthill, formicary, kopje, koppie.

mound (noun)	molehill (noun)
the position on a baseball team of the player who throws the ball for a batter to try to hit	a mound of earth made by moles while burrowing
structure consisting of an artificial heap or bank usually of earth or stones
(baseball) the slight elevation on which the pitcher stands
a collection of objects laid on top of each other
a small natural hill

mound (verb)	molehill (verb)
form into a rounded elevation