clustering vs tuft

clustering and tuft both are nouns.

Word	Noun	Adjective	Verb	Adverb
clustering	Yes	No	No	No
tuft	Yes	No	No	No

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

Other hyponyms of clustering include knot, swad, tussock.

clustering (noun)	tuft (noun)
a grouping of a number of similar things	a bunch of feathers or hair
	a bunch of hair or feathers or growing grass