knave vs varlet

knave and varlet both are nouns.

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

As nouns, knave and varlet are synonyms defined as:

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

knave (noun)	varlet (noun)
one of four face cards in a deck bearing a picture of a young prince	in medieval times a youth acting as a knight's attendant as the first stage in training for knighthood
a deceitful and unreliable scoundrel	a deceitful and unreliable scoundrel