little terror vs brat

little terror and brat both are nouns.

Word	Noun	Adjective	Verb	Adverb
little terror	Yes	No	No	No
brat	Yes	No	No	No

As nouns, little terror and brat are synonyms defined as:

Other synonyms of little terror include holy terror, terror.

little terror (noun)	brat (noun)
a very troublesome child	a very troublesome child
	a small pork sausage