I.
noun
1 playing card
2 winning first hit in tennis
VERB + ACE
▪ serve
▪
Nadal has served 15 ~s in the match so far.
3 person who is very good at sth
ADJECTIVE
▪ fighter , flying , goal ( BrE ), soccer , tennis
▪ staff ( AmE )
▪
Staff ~ Robert Robson helped the team to its first win this season.
II.
verb
Ace is used with these nouns as the object: ↑ class , ↑ exam
III.
adj.
Ace is used with these nouns: ↑ reporter