rascal vs nipper

rascal and nipper both are nouns.

Word	Noun	Adjective	Verb	Adverb
rascal	Yes	No	No	No
nipper	Yes	No	No	No

As nouns, nipper is a hypernym of rascal; that is, nipper is a word with a broader meaning than rascal:

Other hypernyms of rascal include child, fry, kid, minor, nestling, shaver, small fry, tiddler, tike, tyke, youngster.

rascal (noun)	nipper (noun)
one who is playfully mischievous	a grasping structure on the limb of a crustacean or other arthropods
a deceitful and unreliable scoundrel	a young person of either sex