impendence vs impendency

impendence and impendency both are nouns.

Word	Noun	Adjective	Verb	Adverb
impendence	Yes	No	No	No
impendency	Yes	No	No	No

As nouns, impendence and impendency are synonyms defined as:

impendence and impendency: the state of being imminent and liable to happen soon

Other synonyms of impendence include forthcomingness, imminence, imminency, imminentness.

impendence (noun)	impendency (noun)
the state of being imminent and liable to happen soon	the state of being imminent and liable to happen soon