castigation vs dressing down

castigation and dressing down both are nouns.

Word	Noun	Adjective	Verb	Adverb
castigation	Yes	No	No	No
dressing down	Yes	No	No	No

As nouns, castigation and dressing down are synonyms defined as:

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

castigation (noun)	dressing down (noun)
verbal punishment	a severe scolding
a severe scolding