head game vs dissembling

head game and dissembling both are nouns.

Word	Noun	Adjective	Verb	Adverb
head game	Yes	No	No	No
dissembling	Yes	No	No	No

As nouns, dissembling is a hypernym of head game; that is, dissembling is a word with a broader meaning than head game:

Other hypernyms of head game include deceit, deception, dissimulation.

head game (noun)	dissembling (noun)
the act of deluding; deception by creating illusory ideas	the act of deceiving
	pretending with intention to deceive