mummer vs histrion

mummer and histrion both are nouns.

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

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

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

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