disproportion vs imbalance

disproportion and imbalance both are nouns.

Word	Noun	Adjective	Verb	Adverb
disproportion	Yes	No	No	No
imbalance	Yes	No	No	No

As nouns, disproportion and imbalance are synonyms defined as:

disproportion and imbalance: lack of proportion; imbalance among the parts of something

Other synonyms of disproportion include dissymmetry.

disproportion (noun)	imbalance (noun)
lack of proportion; imbalance among the parts of something	lack of proportion; imbalance among the parts of something
	a lack of balance or state of disequilibrium