computer science vs firewall

computer science and firewall both are nouns.

Word	Noun	Adjective	Verb	Adverb
computer science	Yes	No	No	No
firewall	Yes	No	No	No

computer science (noun)	firewall (noun)
the branch of engineering science that studies (with the aid of computers) computable processes and structures	(colloquial) the application of maximum thrust
	a fireproof (or fire-resistant) wall designed to prevent the spread of fire through a building or a vehicle
	(computing) a security system consisting of a combination of hardware and software that limits the exposure of a computer or computer network to attack from crackers; commonly used on local area networks that are connected to the internet