protrusion vs protrude

protrusion is a noun but protrude is not a noun.

Word	Noun	Adjective	Verb	Adverb
protrusion	Yes	No	No	No
protrude	No	No	Yes	No

protrusion (noun)	protrude (noun)
the act of projecting out from something
something that bulges out or is protuberant or projects from its surroundings

protrusion (verb)	protrude (verb)
	swell or protrude outwards
	bulge outward
	extend out or project in space