register vs registration

register and registration both are nouns.

Word	Noun	Adjective	Verb	Adverb
register	Yes	No	Yes	No
registration	Yes	No	No	No

register (noun)	registration (noun)
a regulator (as a sliding plate) for regulating the flow of air into a furnace or other heating device	the act of enrolling
an air passage (usually in the floor or a wall of a room) for admitting or excluding heated air from the room	the act of adjusting something to match a standard
a cashbox with an adding machine to register transactions; used in shops to add up the bill	(music) the sound property resulting from a combination of organ stops used to perform a particular piece of music; the technique of selecting and adjusting organ stops
(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	a document certifying an act of registering
(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	the body of people (such as students) who register or enroll at the same time
an official written record of names or events or transactions
a book in which names and transactions are listed

register (verb)	registration (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