ranger vs fire warden

ranger and fire warden both are nouns.

Word	Noun	Adjective	Verb	Adverb
ranger	Yes	No	No	No
fire warden	Yes	No	No	No

As nouns, ranger and fire warden are synonyms defined as:

ranger and fire warden: an official who is responsible for managing and protecting an area of forest

Other synonyms of ranger include forest fire fighter.

ranger (noun)	fire warden (noun)
an official who is responsible for managing and protecting an area of forest	an official who is responsible for managing and protecting an area of forest
a member of a military unit trained as shock troops for hit-and-run raids