skullduggery vs jiggery-pokery

skullduggery and jiggery-pokery both are nouns.

Word	Noun	Adjective	Verb	Adverb
skullduggery	Yes	No	No	No
jiggery-pokery	Yes	No	No	No

As nouns, skullduggery and jiggery-pokery are synonyms defined as:

skullduggery and jiggery-pokery: verbal misrepresentation intended to take advantage of you in some way

Other synonyms of skullduggery include hanky panky, hocus-pocus, skulduggery, slickness, trickery.

skullduggery (noun)	jiggery-pokery (noun)
verbal misrepresentation intended to take advantage of you in some way	verbal misrepresentation intended to take advantage of you in some way