retrogaming vs gaming

retrogaming and gaming both are nouns.

Word	Noun	Adjective	Verb	Adverb
retrogaming	Yes	No	No	No
gaming	Yes	No	No	No

As nouns, gaming is a hypernym of retrogaming; that is, gaming is a word with a broader meaning than retrogaming:

retrogaming: The hobby of playing or collecting older video games and computer games.
gaming: the act of playing for stakes in the hope of winning (including the payment of a price for a chance to win a prize)

Other hypernyms of retrogaming include gambling, play.

retrogaming (noun)	gaming (noun)
The hobby of playing or collecting older video games and computer games.	the act of playing for stakes in the hope of winning (including the payment of a price for a chance to win a prize)