From Longman Dictionary of Contemporary Englishmummermum‧mer /ˈmʌmə $ -ər/ noun [countable] APTan actor in a simple traditional play that does not have words —mumming noun [uncountable]
Examples from the Corpus
mummer• Capering through contemporary photography like a mummer gatecrashing the court ball, Jo Spence showed up all the medium's conceits.• But the Christmas mummers remained - and some who read this will be able to recall them.• Stalls were out and there were mummers performing miracle plays. 