aberrancy vs aberration

aberrancy and aberration both are nouns.

Word	Noun	Adjective	Verb	Adverb
aberrancy	Yes	No	No	No
aberration	Yes	No	No	No

As nouns, aberrancy and aberration are synonyms defined as:

aberrancy and aberration: a state or condition markedly different from the norm

Other synonyms of aberrancy include aberrance, deviance.

aberrancy (noun)	aberration (noun)
a state or condition markedly different from the norm	an optical phenomenon resulting from the failure of a lens or mirror to produce a good image
	a disorder in one's mental state
	a state or condition markedly different from the norm