ranger vs forest fire fighter

ranger and forest fire fighter both are nouns.

Word	Noun	Adjective	Verb	Adverb
ranger	Yes	No	No	No
forest fire fighter	Yes	No	No	No

As nouns, ranger and forest fire fighter are synonyms defined as:

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

Other synonyms of ranger include fire warden.

ranger (noun)	forest fire fighter (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