We don't have synonyms for taxer yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are taper, tamer and taxed.
(n) :
(UK, Cambridge University, historical) One of two officers chosen yearly to regulate the assize of bread, and to see the true gauge of weights and measures is observed.
(n) :
(UK, Cambridge University, historical) One of two officers chosen yearly to regulate the assize of bread, and to see the true gauge of weights and measures is observed.