skullduggery vs deceit

skullduggery and deceit both are nouns.

Word	Noun	Adjective	Verb	Adverb
skullduggery	Yes	No	No	No
deceit	Yes	No	No	No

As nouns, deceit is a hypernym of skullduggery; that is, deceit is a word with a broader meaning than skullduggery:

skullduggery: verbal misrepresentation intended to take advantage of you in some way
deceit: a misleading falsehood

Other hypernyms of skullduggery include deception, misrepresentation.

skullduggery (noun)	deceit (noun)
verbal misrepresentation intended to take advantage of you in some way	the act of deceiving
	the quality of being fraudulent
	a misleading falsehood