panegyrist vs rhetorician

panegyrist and rhetorician both are nouns.

Word	Noun	Adjective	Verb	Adverb
panegyrist	Yes	No	No	No
rhetorician	Yes	No	No	No

As nouns, rhetorician is a hypernym of panegyrist; that is, rhetorician is a word with a broader meaning than panegyrist:

Other hypernyms of panegyrist include orator, public speaker, speechifier, speechmaker.

panegyrist (noun)	rhetorician (noun)
an orator who delivers eulogies or panegyrics	a person who delivers a speech or oration