playactor vs histrion

playactor and histrion both are nouns.

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

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

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

playactor (noun)	histrion (noun)
an actor who travels around the country presenting plays	a theatrical performer