Technically, everyone who travels with a theater production or concert tour in order to assist with the production is considered a roadie. So, stagehands are roadies, IF they travel with the show. (Local laborers working as stagehands are not considered roadies.)
According to legendary long-time guitar tech Ace Bergman:
“Roadies are ANYONE who is part of the touring road crew. I [Guitar Tech] am a ‘roadie.’ U2’s tour manager is a ‘roadie.’ Beyoncé’s wardrobe supervisor is a ‘roadie.’”