What's the difference between guiser and mummer?

Guiser

Definition:

• (n.) A person in disguise; a masker; a mummer.

Example Sentences:

Mummer

Definition:

• (n.) One who mumms, or makes diversion in disguise; a masker; a buffon.

Example Sentences:

• (1) He managed to stay for five years, founded The Mummers, the first university drama group to admit women, and edited Granta.