register vs computer science

register and computer science both are nouns.

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

register (noun)	computer science (noun)
a regulator (as a sliding plate) for regulating the flow of air into a furnace or other heating device	the branch of engineering science that studies (with the aid of computers) computable processes and structures
an air passage (usually in the floor or a wall of a room) for admitting or excluding heated air from the room
a cashbox with an adding machine to register transactions; used in shops to add up the bill
(computer science) memory device that is the part of computer memory that has a specific address and that is used to hold information of a specific kind
(music) the timbre that is characteristic of a certain range and manner of production of the human voice or of different pipe organ stops or of different musical instruments
an official written record of names or events or transactions
a book in which names and transactions are listed

register (verb)	computer science (verb)
enter into someone's consciousness
indicate a certain reading; of gauges and instruments
record in a public office or in a court of law
send by registered mail
manipulate the registers of an organ
be aware of
show in one's face
record in writing; enter into a book of names or events or transactions
enroll to vote
have one's name listed as a candidate for several parties