scallywag vs brat

scallywag and brat both are nouns.

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

As nouns, brat is a hyponym of scallywag; that is, brat is a word with a more specific, narrower meaning than scallywag:

Other hyponyms of scallywag include holy terror, little terror, terror.

scallywag (noun)	brat (noun)
one who is playfully mischievous	a very troublesome child
a deceitful and unreliable scoundrel	a small pork sausage
a white Southerner who supported Reconstruction policies after the American Civil War (usually for self-interest)