formality vs formalness

formality and formalness both are nouns.

Word	Noun	Adjective	Verb	Adverb
formality	Yes	No	No	No
formalness	Yes	No	No	No

As nouns, formality and formalness are synonyms defined as:

formality and formalness: a manner that strictly observes all forms and ceremonies

formality (noun)	formalness (noun)
compliance with formal rules	a manner that strictly observes all forms and ceremonies
a manner that strictly observes all forms and ceremonies
a requirement of etiquette or custom