muckheap vs midden

muckheap and midden both are nouns.

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

As nouns, muckheap and midden are synonyms defined as:

Other synonyms of muckheap include dunghill, muckhill.

muckheap (noun)	midden (noun)
a heap of dung or refuse	a heap of dung or refuse
	(archeology) a mound of domestic refuse containing shells and animal bones marking the site of a prehistoric settlement