shopper shopper /ˈʃɑːpɝ/

noun

1. () Someone who visits stores in search of articles to buy  ( shopper )
   someone who visits stores in search of articles to buy
   
2. A commercial agent who shops at the competitor's store in order to compare their prices and merchandise with those of the store that employs her  ( shopper )
   a commercial agent who shops at the competitor's store in order to compare their prices and merchandise with those of the store that employs her