proportionality vs ratio

proportionality and ratio both are nouns.

Word	Noun	Adjective	Verb	Adverb
proportionality	Yes	No	No	No
ratio	Yes	No	No	No

As nouns, ratio is a hypernym of proportionality; that is, ratio is a word with a broader meaning than proportionality:

proportionality: a ratio of two quantities that is constant
ratio: the relative magnitudes of two quantities (usually expressed as a quotient)

proportionality (noun)	ratio (noun)
harmonious arrangement or relation of parts or elements within a whole (as in a design)	the relation between things (or parts of things) with respect to their comparative quantity, magnitude, or degree
a ratio of two quantities that is constant	the relative magnitudes of two quantities (usually expressed as a quotient)