ace

adjective

1
a serve that the receiver is unable to reach
2
a major strategic headquarters of NATO; safeguards an area extending from Norway to Turkey
3
proteolytic enzyme that converts angiotensin I into angiotensin II
4
one of four playing cards in a deck having a single pip on its face
5
someone who is dazzlingly skilled in any field
6
the smallest whole number or a numeral representing this number
he has the one but will need a two and three to go with it
they had lunch at one

1
serve an ace against (someone)
2
play (a hole) in one stroke
3
score an ace against
He aced his opponents
4
succeed at easily
She sailed through her exams
You will pass with flying colors

Also useful for “ace”:Unscrambler— Turn loose letters into real words