ACES

a playing card with a single spot on it, ranked as the highest card in its suit in most card games

a person who excels at a particular sport or other activity

(in tennis and similar games) a service that an opponent is unable to return and thus wins a point

very good

(in tennis and similar games) serve an ace against (an opponent)

achieve high marks in (a test or exam)

a person who has no sexual feelings or desires

(of a person) having no sexual feelings or desires; asexual