register vs file

register and file both are nouns.

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

As verbs, register and file are synonyms defined as:

As verbs, file is a hyponym of register; that is, file 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
file: record in a public office or in a court of law

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

register (noun)	file (noun)
a regulator (as a sliding plate) for regulating the flow of air into a furnace or other heating device	a steel hand tool with small sharp teeth on some or all of its surfaces; used for smoothing wood or metal
an air passage (usually in the floor or a wall of a room) for admitting or excluding heated air from the room	office furniture consisting of a container for keeping papers in order
a cashbox with an adding machine to register transactions; used in shops to add up the bill	a set of related records (either written or electronic) kept together
(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 line of persons or things ranged one behind the other
(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)	file (verb)
enter into someone's consciousness	place in a container for keeping records
indicate a certain reading; of gauges and instruments	file a formal charge against
record in a public office or in a court of law	record in a public office or in a court of law
send by registered mail	smooth with a file
manipulate the registers of an organ	proceed in line
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