unbalance vs imbalance

unbalance and imbalance both are nouns.

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

As nouns, unbalance and imbalance are synonyms defined as:

Other synonyms of unbalance include instability.

unbalance (noun)	imbalance (noun)
a lack of balance or state of disequilibrium	lack of proportion; imbalance among the parts of something
a state of mental disturbance and disorientation	a lack of balance or state of disequilibrium

unbalance (verb)	imbalance (verb)
derange mentally, throw out of mental balance; make insane
throw out of balance or equilibrium