record-keeper vs registrar

record-keeper and registrar both are nouns.

Word	Noun	Adjective	Verb	Adverb
record-keeper	Yes	No	No	No
registrar	Yes	No	No	No

As nouns, record-keeper and registrar are synonyms defined as:

Other synonyms of record-keeper include recorder.

record-keeper (noun)	registrar (noun)
someone responsible for keeping records	someone responsible for keeping records
	the administrator responsible for student records
	a person employed to keep a record of the owners of stocks and bonds issued by the company