registrar vs functionary

registrar and functionary both are nouns.

Word	Noun	Adjective	Verb	Adverb
registrar	Yes	No	No	No
functionary	Yes	No	No	No

As nouns, functionary is a hypernym of registrar; that is, functionary is a word with a broader meaning than registrar:

Other hypernyms of registrar include official.

registrar (noun)	functionary (noun)
someone responsible for keeping records	a worker who holds or is invested with an office
the administrator responsible for student records
a person employed to keep a record of the owners of stocks and bonds issued by the company