tragedian vs histrion

tragedian and histrion both are nouns.

Word	Noun	Adjective	Verb	Adverb
tragedian	Yes	No	No	No
histrion	Yes	No	No	No

As nouns, histrion is a hypernym of tragedian; that is, histrion is a word with a broader meaning than tragedian:

Other hypernyms of tragedian include actor, player, role player, thespian.

tragedian (noun)	histrion (noun)
an actor who specializes in tragic roles	a theatrical performer
a writer (especially a playwright) who writes tragedies