turbulency vs turbulence

turbulency and turbulence both are nouns.

Word	Noun	Adjective	Verb	Adverb
turbulency	Yes	No	No	No
turbulence	Yes	No	No	No

As nouns, turbulency and turbulence are synonyms defined as:

turbulency (noun)	turbulence (noun)
unstable flow of a liquid or gas	unstable flow of a liquid or gas
	a state of violent disturbance and disorder (as in politics or social conditions generally)
	instability in the atmosphere