chewing out vs castigation

chewing out and castigation both are nouns.

Word	Noun	Adjective	Verb	Adverb
chewing out	Yes	No	No	No
castigation	Yes	No	No	No

As nouns, chewing out and castigation are synonyms defined as:

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

chewing out (noun)	castigation (noun)
a severe scolding	verbal punishment
	a severe scolding