continence vs continency

continence and continency both are nouns.

Word	Noun	Adjective	Verb	Adverb
continence	Yes	No	No	No
continency	Yes	No	No	No

As nouns, continence and continency are synonyms defined as:

continence and continency: the exercise of self constraint in sexual matters

continence (noun)	continency (noun)
the exercise of self constraint in sexual matters	the exercise of self constraint in sexual matters
voluntary control over urinary and fecal discharge