brat vs rapscallion

brat and rapscallion both are nouns.

Word	Noun	Adjective	Verb	Adverb
brat	Yes	No	No	No
rapscallion	Yes	No	No	No

As nouns, rapscallion is a hypernym of brat; that is, rapscallion is a word with a broader meaning than brat:

Other hypernyms of brat include imp, monkey, rascal, scalawag, scallywag, scamp.

brat (noun)	rapscallion (noun)
a very troublesome child	one who is playfully mischievous
a small pork sausage	a deceitful and unreliable scoundrel