sophist

noun3

1. •
   (figurative) A teacher who uses plausible but fallacious reasoning.
2. •
   (figurative) One who is captious, fallacious, or deceptive in argument.

   • [T]hey have acted in this Calumny both the injustice of the Tyrant, and the forgery of the Sophist. — 1699
3. •
   (old-fashioned) Synonym of sophister (“university student who has completed at least one year”).

noun1

1. •
   (historical) A teacher in Ancient Greece, particularly (derogatory) teachers of oratory noted for their disingenuous argumentation and fallacious reasoning.