rangefinder vs range finder

rangefinder and range finder both are nouns.

Word	Noun	Adjective	Verb	Adverb
rangefinder	Yes	No	No	No
range finder	Yes	No	No	No

As nouns, rangefinder and range finder are synonyms defined as:

rangefinder and range finder: a measuring instrument (acoustic or optical or electronic) for finding the distance of an object

rangefinder (noun)	range finder (noun)
a measuring instrument (acoustic or optical or electronic) for finding the distance of an object	a measuring instrument (acoustic or optical or electronic) for finding the distance of an object