brattiness vs juvenility

brattiness and juvenility both are nouns.

Word	Noun	Adjective	Verb	Adverb
brattiness	Yes	No	No	No
juvenility	Yes	No	No	No

As nouns, juvenility is a hypernym of brattiness; that is, juvenility is a word with a broader meaning than brattiness:

brattiness: The state or condition of acting like a brat, being unruly and impolite.
juvenility: lacking and evidencing lack of experience of life

Other hypernyms of brattiness include callowness, jejuneness.

brattiness (noun)	juvenility (noun)
The state or condition of acting like a brat, being unruly and impolite.	the freshness and vitality characteristic of a young person
	lacking and evidencing lack of experience of life