detergence vs detergency

detergence and detergency both are nouns.

Word	Noun	Adjective	Verb	Adverb
detergence	Yes	No	No	No
detergency	Yes	No	No	No

As nouns, detergence and detergency are synonyms defined as:

detergence and detergency: detergent quality; the quality of having cleansing power

detergence (noun)	detergency (noun)
detergent quality; the quality of having cleansing power	detergent quality; the quality of having cleansing power