We don't have synonyms for abbreviator yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are abbreviate, abbreviation and abbreviated.
(n) :
(Roman Catholicism, historical) One of a college of seventy-two officers of the papal court whose duty was to make a short minute of a decision on a petition, or reply of the pope to a letter, and afterwards expand the minute into official form.
(n) :
(Roman Catholicism, historical) One of a college of seventy-two officers of the papal court whose duty was to make a short minute of a decision on a petition, or reply of the pope to a letter, and afterwards expand the minute into official form.