mummer vs actor

mummer and actor both are nouns.

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

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

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

mummer (noun)	actor (noun)
an actor who communicates entirely by gesture and facial expression	a theatrical performer
	a person who acts and gets things done