competence vs competency

competence and competency both are nouns.

Word	Noun	Adjective	Verb	Adverb
competence	Yes	No	No	No
competency	Yes	No	No	No

As nouns, competence and competency are synonyms defined as:

competence and competency: the quality of being adequately or well qualified physically and intellectually

competence (noun)	competency (noun)
the quality of being adequately or well qualified physically and intellectually	the quality of being adequately or well qualified physically and intellectually