I would differentiate between the following hunters and farmers:
Hunters are salespeople whose main responsibility is to bring in new business for a company, be it by cold-calling over the phone or by going door to door.
Farmers focus solely on existing accounts, ensuring their needs are being met and often finding new ways to sell their company's services to their clients.
Sales Representatives: Sell products
Sales operations analyst: Everything around the sales process
Business Development: Developing and implementing growth opportunities between multiple organizations.
Account Manager: Takes care about the current clients and their needs
If you need any further help on sales roles or in general about sales, please feel free to contact me.