frame of reference vs coordinate system

frame of reference and coordinate system both are nouns.

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

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

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

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

frame of reference (noun)	coordinate system (noun)
a system that uses coordinates to establish position	a system that uses coordinates to establish position
a system of assumptions and standards that sanction behavior and give it meaning