impendency vs imminency

impendency and imminency both are nouns.

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

As nouns, impendency and imminency are synonyms defined as:

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

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

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