We don't have synonyms for grammary yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are grammar, granary and gramma.
(n) :
(archaic) Alternative spelling of grammar. [(countable and uncountable, linguistics) A system of rules and principles for the structure of a language, or of languages in general.]
(n) :
(archaic) Alternative form of gramarye. [(obsolete) Grammar; learning.]
(n) :
(archaic) Alternative spelling of grammar. [(countable and uncountable, linguistics) A system of rules and principles for the structure of a language, or of languages in general.]
(n) :
(archaic) Alternative form of gramarye. [(obsolete) Grammar; learning.]