game studies vs ludology

game studies and ludology both are nouns.

Word	Noun	Adjective	Verb	Adverb
game studies	Yes	No	No	No
ludology	Yes	No	No	No

As nouns, game studies and ludology are synonyms defined as:

game studies and ludology: The study of games and gaming, especially video games.

game studies (noun)	ludology (noun)
The study of games and gaming, especially video games.	The study of games and gaming, especially video games.