Knave
Part of speech: noun
Definition: A tricky, deceitful fellow; a dishonest person; a rogue; a villain. A playing card marked with the figure of a servant or soldier; a jack. A boy; especially, a boy servant. Any male servant; a menial.
Example sentence: Very often, say what you will, a knave is only a fool.
Scallywag
Part of speech: noun
Definition: A rascal.