double-dealing vs dissembling

double-dealing and dissembling both are nouns.

Word	Noun	Adjective	Verb	Adverb
double-dealing	Yes	Yes	No	No
dissembling	Yes	No	No	No

As nouns, dissembling is a hypernym of double-dealing; that is, dissembling is a word with a broader meaning than double-dealing:

double-dealing: acting in bad faith; deception by pretending to entertain one set of intentions while acting under the influence of another
dissembling: the act of deceiving

Other hypernyms of double-dealing include deceit, deception, dissimulation.

double-dealing (noun)	dissembling (noun)
acting in bad faith; deception by pretending to entertain one set of intentions while acting under the influence of another	the act of deceiving
	pretending with intention to deceive

double-dealing (adjective)	dissembling (adjective)
marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another