Summer theater is a popular form of entertainment during the warmer months, and there are many different ways to describe it using various synonyms. One option is "outdoor theater," which emphasizes the fact that these productions take place outdoors, often under the stars. Another possible synonym is "summer stock theater," which refers to the tradition of producing plays and musicals during the summer months using a group of resident actors and crew. "Summer repertory theater" is another term that can be used to describe this type of production, as it often involves a rotating schedule of shows that are performed over the course of the season.