What is another word for "commentator"?

Roget's Thesaurus (1911) lists these synonyms for "commentator": annotator, article, canvass, cicerone, commentary, consideration, courier, critic, criticism, critique, deal, delve, demonstrator, descant, discourse, discoursive, discursive, discuss, discussion, disquisition, disquisitionary, dissert, dissertation, dragoman, editorial, essay, essayist, excursus, explainer, explanation, exponent, exposition, expositor, expository, expound, expounder, forth, glossarist, handle, hold.