clump vs tussock

clump and tussock both are nouns.

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

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

Other hyponyms of clump include knot, swad, tuft.

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

clump (verb)	tussock (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