youthfulness vs juvenility

youthfulness and juvenility both are nouns.

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

As nouns, youthfulness and juvenility are synonyms defined as:

youthfulness and juvenility: the freshness and vitality characteristic of a young person

Other synonyms of youthfulness include youth.

youthfulness (noun)	juvenility (noun)
the freshness and vitality characteristic of a young person	the freshness and vitality characteristic of a young person
	lacking and evidencing lack of experience of life