clutter vs rummage

clutter and rummage both are nouns.

Word	Noun	Adjective	Verb	Adverb
clutter	Yes	No	Yes	No
rummage	Yes	No	Yes	No

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

clutter (noun)	rummage (noun)
unwanted echoes that interfere with the observation of signals on a radar screen	a thorough search for something (often causing disorder or confusion)
a confused multitude of things	a jumble of things to be given away

clutter (verb)	rummage (verb)
fill a space in a disorderly way	search haphazardly