acer is a form of:

Ace



noun — Plural: Aces
1.
The one at dice. cards, dominoes, with a single spot; an expert, firstclass, single point the best, highest, an outstanding fighter pilot. Cards. សន្លឹកអាត់ល្បែងបៀ flying ace អ្នកពូកែមែនទែនខាងអ្វីម៉្យាង
adjective
1.
ដែលចំណាន, ដែលពូកែ
ENGLISH MEANING
noun — Plural: Aces
1.
A unit; a single point or spot on a card or die; the card or die so marked; as, the ace of diamonds.
2.
Hence: A very small quantity or degree; a particle; an atom; a jot.
3.
A single point won by a stroke, as in handball, rackets, etc.; in tennis, frequently, a point won by a service stroke.