proportion vs equipoise

proportion and equipoise both are nouns.

Word	Noun	Adjective	Verb	Adverb
proportion	Yes	No	Yes	No
equipoise	Yes	No	No	No

As nouns, equipoise is a hypernym of proportion; that is, equipoise is a word with a broader meaning than proportion:

Other hypernyms of proportion include balance, counterbalance, equilibrium.

proportion (noun)	equipoise (noun)
magnitude or extent	equality of distribution
harmonious arrangement or relation of parts or elements within a whole (as in a design)
the quotient obtained when the magnitude of a part is divided by the magnitude of the whole
the relation between things (or parts of things) with respect to their comparative quantity, magnitude, or degree
balance among the parts of something

proportion (verb)	equipoise (verb)
adjust in size relative to other things
give pleasant proportions to