pantomimer vs histrion

pantomimer and histrion both are nouns.

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

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

pantomimer: an actor who communicates entirely by gesture and facial expression
histrion: a theatrical performer

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

pantomimer (noun)	histrion (noun)
an actor who communicates entirely by gesture and facial expression	a theatrical performer