reference system vs reference frame

reference system and reference frame both are nouns.

Word	Noun	Adjective	Verb	Adverb
reference system	Yes	No	No	No
reference frame	Yes	No	No	No

As nouns, reference system and reference frame are synonyms defined as:

reference system and reference frame: a system that uses coordinates to establish position

Other synonyms of reference system include coordinate system, frame of reference.

reference system (noun)	reference frame (noun)
a system that uses coordinates to establish position	a system that uses coordinates to establish position