wiliness vs slyness

wiliness and slyness both are nouns.

Word	Noun	Adjective	Verb	Adverb
wiliness	Yes	No	No	No
slyness	Yes	No	No	No

As nouns, wiliness and slyness are synonyms defined as:

wiliness and slyness: shrewdness as demonstrated by being skilled in deception

Other synonyms of wiliness include craft, craftiness, cunning, foxiness, guile.

wiliness (noun)	slyness (noun)
shrewdness as demonstrated by being skilled in deception	shrewdness as demonstrated by being skilled in deception