agent vs functionary

agent and functionary both are nouns.

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

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

Other hypernyms of agent include official.

agent (noun)	functionary (noun)
the semantic role of the animate entity that instigates or causes the happening denoted by the verb in the clause	a worker who holds or is invested with an office
an active and efficient cause; capable of producing a certain effect
a businessman who buys or sells for another in exchange for a commission
a representative who acts on behalf of other persons or organizations
any agent or representative of a federal agency or bureau
a substance that exerts some force or effect