Definitions:

1. a self-propelled wheeled vehicle designed specifically to carry something noun
   • refrigerated carriers have revolutionized the grocery business
2. someone whose employment involves carrying something noun
   • the bonds were transmitted by carrier

Synonyms:

• aircraft carrier
• bearer
• carrier wave
• common carrier
• immune carrier
• letter carrier
• mail carrier
• mailman
• newsboy
• postman
• toter