A person who travels from place to place performing theatrical shows, political campaigns, or aerobatic flying displays.
From barnstorm plus the agent noun suffix -er, meaning 'one who barnstorms.'
The most famous barnstormers were early pilots like Amelia Earhart and Charles Lindbergh, whose daring aerial tours made flying real to people in tiny towns who'd never seen an airplane!
Complete word intelligence in one call. Free tier — 50 lookups/day.