protrude vs pouch

protrude is not a noun while pouch is a noun.

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

As verbs, protrude and pouch are synonyms defined as:

Other synonyms of protrude include bulge.

protrude (noun)	pouch (noun)
	a small or medium size container for holding or carrying things
	(anatomy) saclike structure in any of various animals (as a marsupial or gopher or pelican)
	an enclosed space

protrude (verb)	pouch (verb)
swell or protrude outwards	swell or protrude outwards
bulge outward	put into a small bag
extend out or project in space	send by special mail that goes through diplomatic channels