mare's nest vs rummage

mare's nest and rummage both are nouns.

Word	Noun	Adjective	Verb	Adverb
mare's nest	Yes	No	No	No
rummage	Yes	No	Yes	No

As nouns, rummage is a hyponym of mare's nest; that is, rummage is a word with a more specific, narrower meaning than mare's nest:

mare's nest (noun)	rummage (noun)
a confused multitude of things	a thorough search for something (often causing disorder or confusion)
	a jumble of things to be given away

mare's nest (verb)	rummage (verb)
	search haphazardly