imperfectness vs imperfection

imperfectness and imperfection both are nouns.

Word	Noun	Adjective	Verb	Adverb
imperfectness	Yes	No	No	No
imperfection	Yes	No	No	No

As nouns, imperfectness and imperfection are synonyms defined as:

imperfectness and imperfection: the state or an instance of being imperfect

imperfectness (noun)	imperfection (noun)
the state or an instance of being imperfect	the state or an instance of being imperfect