informal vs informality

informal is not a noun while informality is a noun.

Word	Noun	Adjective	Verb	Adverb
informal	No	Yes	No	No
informality	Yes	No	No	No

informal (noun)	informality (noun)
	a manner that does not take forms and ceremonies seriously
	freedom from constraint or embarrassment

informal (adjective)	informality (adjective)
not formal
used of spoken and written language
having or fostering a warm or friendly and informal atmosphere
not officially recognized or controlled