puerility vs childishness

puerility and childishness both are nouns.

Word	Noun	Adjective	Verb	Adverb
puerility	Yes	No	No	No
childishness	Yes	No	No	No

As nouns, puerility and childishness are synonyms defined as:

puerility (noun)	childishness (noun)
a property characteristic of a child	a property characteristic of a child
the state of a child between infancy and adolescence