ambidextrousness vs ambidexterity

ambidextrousness and ambidexterity both are nouns.

Word	Noun	Adjective	Verb	Adverb
ambidextrousness	Yes	No	No	No
ambidexterity	Yes	No	No	No

As nouns, ambidextrousness and ambidexterity are synonyms defined as:

ambidextrousness and ambidexterity: the property of being equally skillful with each hand

ambidextrousness (noun)	ambidexterity (noun)
the property of being equally skillful with each hand	the property of being equally skillful with each hand