pierce vs tusk

pierce is not a noun while tusk is a noun.

Word	Noun	Adjective	Verb	Adverb
pierce	No	No	Yes	No
tusk	Yes	No	Yes	No

As verbs, tusk is a hyponym of pierce; that is, tusk is a word with a more specific, narrower meaning than pierce:

Other hyponyms of pierce include stick, stick, peg, center punch, empale, impale, spike, transfix, horn, gore, lance.

pierce (noun)	tusk (noun)
	a long pointed tooth specialized for fighting or digging; especially in an elephant or walrus or hog
	a hard smooth ivory colored dentine that makes up most of the tusks of elephants and walruses

pierce (verb)	tusk (verb)
make a hole into	remove the tusks of animals
penetrate or cut through with a sharp instrument	stab or pierce with a horn or tusk
cut or make a way through
move or affect (a person's emotions or bodily feelings) deeply or sharply
sound sharply or shrilly