castigation vs earful

castigation and earful both are nouns.

Word	Noun	Adjective	Verb	Adverb
castigation	Yes	No	No	No
earful	Yes	No	No	No

As nouns, castigation and earful are synonyms defined as:

Other synonyms of castigation include bawling out, chewing out, dressing down, going-over, upbraiding.

castigation (noun)	earful (noun)
verbal punishment	a severe scolding
a severe scolding	an outpouring of gossip