aspect ratio vs ratio

aspect ratio and ratio both are nouns.

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

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

aspect ratio: the ratio of the width to the height of a tv picture
ratio: the relative magnitudes of two quantities (usually expressed as a quotient)

aspect ratio (noun)	ratio (noun)
the ratio of the width to the height of a tv picture	the relation between things (or parts of things) with respect to their comparative quantity, magnitude, or degree
	the relative magnitudes of two quantities (usually expressed as a quotient)