register vs enter

register is a noun but enter is not a noun.

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

As verbs, enter is a hypernym of register; that is, enter is a word with a broader meaning than register:

register: record in writing; enter into a book of names or events or transactions
enter: make a record of; set down in permanent form

Other hypernyms of register include put down, record.

As verbs, enter is a hyponym of register; that is, enter is a word with a more specific, narrower meaning than register:

register: record in writing; enter into a book of names or events or transactions
enter: register formally as a participant or member

Other hyponyms of register include file, register, patent, enrol, enroll, inscribe, raise, recruit, list, book.

As verbs, enter is a hypernym of register; that is, enter is a word with a broader meaning than register:

Other hypernyms of register include enrol, enroll, inscribe, raise, recruit.

register (noun)	enter (noun)
a regulator (as a sliding plate) for regulating the flow of air into a furnace or other heating device
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)	enter (verb)
enter into someone's consciousness	set out on (an enterprise or subject of study)
indicate a certain reading; of gauges and instruments	make a record of; set down in permanent form
record in a public office or in a court of law	become a participant; be involved in
send by registered mail	put or introduce into something
manipulate the registers of an organ	come on stage
be aware of	to come or go into
show in one's face	take on duties or office
record in writing; enter into a book of names or events or transactions	register formally as a participant or member
enroll to vote	be or play a part of or in
have one's name listed as a candidate for several parties