firewall vs computer science

firewall and computer science both are nouns.

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

firewall (noun)	computer science (noun)
(colloquial) the application of maximum thrust	the branch of engineering science that studies (with the aid of computers) computable processes and structures
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