castmate

plural castmates

1. Someone with whom one performs together, as a member of a cast.

   “We are all so utterly devastated by the loss of Matthew,” the five actors said. “We were more than just castmates. We are a family.[…]”

   2023 October 30, Sian Cain, “Friends stars release statement after death of Matthew Perry: ‘We were more than just castmates’”, in The Guardian, →ISSN

   1 more example

   A few feet away, her friend and castmate Tara Ross, also 18, was applying makeup; outside their door, a couple of boys were sacked out on a couch, studying notes in binders.

   2007 June 14, Melena Ryzik, “Unwelcome at Home, Student Play Is a Hit in New York”, in The New York Times