notary public vs functionary

notary public and functionary both are nouns.

Word	Noun	Adjective	Verb	Adverb
notary public	Yes	No	No	No
functionary	Yes	No	No	No

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

notary public: someone legally empowered to witness signatures and certify a document's validity and to take depositions
functionary: a worker who holds or is invested with an office

Other hypernyms of notary public include official.

notary public (noun)	functionary (noun)
someone legally empowered to witness signatures and certify a document's validity and to take depositions	a worker who holds or is invested with an office