LATIN DICTIONARYLexicon Latīnum
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“doer” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

doer
auctor facinoris or delicti; from the context, auctor only. By circumlocution qui, quae facinus, or flagitium, or scelus commisit; qui, quae facinus in se admisit; ad quem, ad quam maleficium pertinet (the doer of a crime); also machinator or princeps atque architectus sceleris: beneficiorum auctor, or qui beneficia in aliquem confert, or contulit (a doer of good): princeps, princeps et architectus alicujus rei (the principal doer of anything): a great talker, but little doer, lingua promptiorquammanu: lingua fortis (Liv., 23, 45); in periculis timidus, sicubi metus absit, inflatus (timid in danger, bold when it is past; Justinus, 2, 10, 23).

Quick answer

What is the Latin word for doer?
The usual Latin words for “doer” are dēlinquō, auctor, flāgitium; also māchinor. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.