loyal customer

• repeatDo or say again
• regularOccurring at fixed intervals
• devotedLoyally and lovingly attached
• faithfulConsistently loyal and true
• patronRegular supporter or customer

returning · trustworthy · membership · rewards · discount · appreciation · retention · subscriber · VIP · brand · habit · longtime · preferred · valued · reliable · shopkeeper · punch card · frequent flyer

• buyersbuyers, buyer, purchasers, purchaser, homebuyers
• supportersfan, patron, supporters, backers, backer
• bank customersdepositor, account holder, borrower, loan applicant, new customer
• retail storedisplay case, checkout lanes, cash register, cashier, inventory
• shoppersshoppers, bargain hunters, window shopper, impulse buyers, window shoppers