midden vs kitchen midden

midden and kitchen midden both are nouns.

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

As nouns, midden and kitchen midden are synonyms defined as:

midden and kitchen midden: (archeology) a mound of domestic refuse containing shells and animal bones marking the site of a prehistoric settlement

Other synonyms of midden include eitchen midden.

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