fire warden vs ranger

fire warden and ranger both are nouns.

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

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

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

Other synonyms of fire warden include forest fire fighter.

fire warden (noun)	ranger (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