aberration vs aberrancy

aberration and aberrancy both are nouns.

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

As nouns, aberration and aberrancy are synonyms defined as:

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

Other synonyms of aberration include aberrance, deviance.

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