mound vs midden

mound and midden both are nouns.

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

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

mound (noun)	midden (noun)
the position on a baseball team of the player who throws the ball for a batter to try to hit	a heap of dung or refuse
structure consisting of an artificial heap or bank usually of earth or stones	(archeology) a mound of domestic refuse containing shells and animal bones marking the site of a prehistoric settlement
(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)	midden (verb)
form into a rounded elevation