varlet vs knave

varlet and knave both are nouns.

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

As nouns, varlet and knave are synonyms defined as:

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

varlet (noun)	knave (noun)
in medieval times a youth acting as a knight's attendant as the first stage in training for knighthood	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