maven vs ace

maven and ace both are nouns.

Word	Noun	Adjective	Verb	Adverb
maven	Yes	No	No	No
ace	Yes	Yes	Yes	No

As nouns, maven and ace are synonyms defined as:

Other synonyms of maven include adept, champion, genius, hotshot, mavin, sensation, star, superstar, virtuoso, whiz, whizz, wiz, wizard.

maven (noun)	ace (noun)
someone who is dazzlingly skilled in any field	a serve that the receiver is unable to reach
	one of four playing cards in a deck having a single pip on its face
	someone who is dazzlingly skilled in any field
	the smallest whole number or a numeral representing this number

maven (adjective)	ace (adjective)
	of the highest quality