wits vs marbles

wits and marbles both are nouns.

Word	Noun	Adjective	Verb	Adverb
wits	Yes	No	No	No
marbles	Yes	No	No	No

As nouns, wits and marbles are synonyms defined as:

wits and marbles: the basic human power of intelligent thought and perception

wits (noun)	marbles (noun)
the basic human power of intelligent thought and perception	a children's game played with little balls made of a hard substance (as glass)
	the basic human power of intelligent thought and perception