rascal vs knave

rascal and knave both are nouns.

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

As nouns, rascal and knave are synonyms defined as:

Other synonyms of rascal include rapscallion, rogue, scalawag, scallywag, varlet.

rascal (noun)	knave (noun)
one who is playfully mischievous	one of four face cards in a deck bearing a picture of a young prince
a deceitful and unreliable scoundrel	a deceitful and unreliable scoundrel