computer science vs peer-to-peer

computer science is a noun but peer-to-peer is not a noun.

Word	Noun	Adjective	Verb	Adverb
computer science	Yes	No	No	No
peer-to-peer	No	Yes	No	No

computer science (noun)	peer-to-peer (noun)
the branch of engineering science that studies (with the aid of computers) computable processes and structures

computer science (adjective)	peer-to-peer (adjective)
	Of a social network of equal partners able to conduct business without using a middle man
	Of a network of two or more computers connected as equal partners and able to share processing, control and access to data and peripherals