complacency vs complacence

complacency and complacence both are nouns.

Word	Noun	Adjective	Verb	Adverb
complacency	Yes	No	No	No
complacence	Yes	No	No	No

As nouns, complacency and complacence are synonyms defined as:

complacency and complacence: the feeling you have when you are satisfied with yourself

Other synonyms of complacency include self-complacency, self-satisfaction.

complacency (noun)	complacence (noun)
the feeling you have when you are satisfied with yourself	the feeling you have when you are satisfied with yourself