tussock vs clump

tussock and clump both are nouns.

Word	Noun	Adjective	Verb	Adverb
tussock	Yes	No	No	No
clump	Yes	No	Yes	No

As nouns, clump is a hypernym of tussock; that is, clump is a word with a broader meaning than tussock:

Other hypernyms of tussock include bunch, cluster, clustering.

tussock (noun)	clump (noun)
a bunch of hair or feathers or growing grass	a heavy dull sound (as made by impact of heavy objects)
	a grouping of a number of similar things
	a compact mass

tussock (verb)	clump (verb)
	gather or cause to gather into a cluster
	walk clumsily
	come together as in a cluster or flock
	make or move along with a sound as of a horse's hooves striking the ground