effectualness vs effectivity

effectualness and effectivity both are nouns.

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

As nouns, effectualness and effectivity are synonyms defined as:

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

Other synonyms of effectualness include effectiveness, effectuality.

effectualness (noun)	effectivity (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