effectivity vs effectualness

effectivity and effectualness both are nouns.

Word	Noun	Adjective	Verb	Adverb
effectivity	Yes	No	No	No
effectualness	Yes	No	No	No

As nouns, effectivity and effectualness are synonyms defined as:

effectivity and effectualness: power to be effective; the quality of being able to bring about an effect

Other synonyms of effectivity include effectiveness, effectuality.

effectivity (noun)	effectualness (noun)
power to be effective; the quality of being able to bring about an effect	power to be effective; the quality of being able to bring about an effect