We don't have synonyms for acers yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are acerb, acer and avers.
(n) :
Obsolete spelling of acre. [An English unit of land area (symbol: a. or ac.) originally denoting a day's ploughing for a yoke of oxen, now standardized as 4,840 square yards or 4,046.86 square metres.]
(n) :
Obsolete spelling of acre. [An English unit of land area (symbol: a. or ac.) originally denoting a day's ploughing for a yoke of oxen, now standardized as 4,840 square yards or 4,046.86 square metres.]