ranger vs functionary

ranger and functionary both are nouns.

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

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

ranger: an official who is responsible for managing and protecting an area of forest
functionary: a worker who holds or is invested with an office

Other hypernyms of ranger include fire-eater, fire fighter, firefighter, fireman, official.

ranger (noun)	functionary (noun)
an official who is responsible for managing and protecting an area of forest	a worker who holds or is invested with an office
a member of a military unit trained as shock troops for hit-and-run raids