There are several synonyms one could use for the phrase "puts in electric chair." Some alternatives might include "executes in electric chair," "electrocutes," or simply "uses electric chair." While these terms all refer to the same basic act of putting someone to death using an electric chair, they can have slightly different nuances in terms of meaning or connotation. For example, "executes" might suggest a more formal or official process, while "electrocutes" might highlight the use of electricity as a method of execution. Ultimately, the choice of phrasing depends on the writer's intended tone and audience.