game show vs giveaway

game show and giveaway both are nouns.

Word	Noun	Adjective	Verb	Adverb
game show	Yes	No	No	No
giveaway	Yes	No	No	No

As nouns, game show and giveaway are synonyms defined as:

game show and giveaway: a television or radio program in which contestants compete for awards

game show (noun)	giveaway (noun)
a television or radio program in which contestants compete for awards	an unintentional disclosure
	a television or radio program in which contestants compete for awards
	a gift of public land or resources for the private gain of a limited group