turbulence vs turbulency

turbulence and turbulency both are nouns.

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

As nouns, turbulence and turbulency are synonyms defined as:

turbulence (noun)	turbulency (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