What's the difference between rethor and rhetorician?

Rethor

Definition:

Example Sentences:

(1) A study of three new cases with different trisomies involving chromosome 9 and a review of about 100 cases of partial trisomy 9 reported in the literature, suggested some cytogenetical and clinical correlations and lead us to propose the nomenclature of Rethore's syndrome type 1 and type 2.

Definition:

(n.) One well versed in the rules and principles of rhetoric.
(n.) A teacher of rhetoric.
(n.) An orator; specifically, an artificial orator without genuine eloquence; a declaimer.
(a.) Suitable to a master of rhetoric.

Example Sentences:

(1) Casuistry is defined, its relationship to rhetorical reasoning and its interpretation of cases, by employing three terms that, while they are not employed by the classical rhetoricians and casuists, conform, in a general way, to the features of their work.
(2) In general terms, Airlie was the strategist and Reid the rhetorician.
(3) Though Tony Blair (currently, in his pronouncements on the EU , highlighting Labour's reputation for floating far above ordinary lives with an amazing absence of self-awareness) was actually a much better rhetorician than received wisdom suggests, everyone around him quickly succumbed to a deadened kind of thought and expression.
(4) And they did so because Trump is a brilliant and careful rhetorician.
(5) He subsequently practiced as a rhetorician, not, it appears, for financial gain, but for personal pleasure, all the while privately pursuing what he called the irresistible itch of writing, chipping out the verses that eventually made him immortal.