Ace

of the highest quality

a major strategic headquarters of NATO; safeguards an area extending from Norway to Turkey

proteolytic enzyme that converts angiotensin I into angiotensin II

someone who is dazzlingly skilled in any field

the smallest whole number or a numeral representing this number

a serve that the receiver is unable to reach

one of four playing cards in a deck having a single pip on its face

score an ace against

succeed at easily

play (a hole) in one stroke

serve an ace against (someone)