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“inventor” in Latin

The English word inventor itself goes back to Latin inveniō, through inventor.

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

inventor
inventor, feminine, inventrix (repertor is †, and post-Augustan): auctor (the original introducer, etc., who is therefore looked up to as an authority): architectus or quasi architectus (the original builder, as it were; hence, the inventor of something that may be considered constructive; e.g., beatae vitae, Cic.). (The words are found in this connection and order.) princeps et architectus (Cic.). The inventors of sculpture, fingendi conditores: an inventor of new words, inventor novorum verborum. Vid: DISCOVERER.

Quick answer

What is the Latin word for inventor?
The usual Latin words for “inventor” are inventor, auctor, architectus. 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.