magnitude relation vs quantitative relation

magnitude relation and quantitative relation both are nouns.

Word	Noun	Adjective	Verb	Adverb
magnitude relation	Yes	No	No	No
quantitative relation	Yes	No	No	No

As nouns, magnitude relation and quantitative relation are synonyms defined as:

magnitude relation and quantitative relation: a relation between magnitudes

magnitude relation (noun)	quantitative relation (noun)
a relation between magnitudes	a relation between magnitudes