hanky panky vs skulduggery

hanky panky and skulduggery both are nouns.

Word	Noun	Adjective	Verb	Adverb
hanky panky	Yes	No	No	No
skulduggery	Yes	No	No	No

As nouns, hanky panky and skulduggery are synonyms defined as:

hanky panky and skulduggery: verbal misrepresentation intended to take advantage of you in some way

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

hanky panky (noun)	skulduggery (noun)
verbal misrepresentation intended to take advantage of you in some way	verbal misrepresentation intended to take advantage of you in some way