potency vs potence

potency and potence both are nouns.

Word	Noun	Adjective	Verb	Adverb
potency	Yes	No	No	No
potence	Yes	No	No	No

As nouns, potency and potence are synonyms defined as:

potency and potence: the state of being potent; a male's capacity to have sexual intercourse

potency (noun)	potence (noun)
capacity to produce strong physiological or chemical effects	the state of being potent; a male's capacity to have sexual intercourse
the power or right to give orders or make decisions
the state of being potent; a male's capacity to have sexual intercourse
the inherent capacity for coming into being