1) Bistro patron 2) Bistro patron, at times 3) Buyer 4) Catalog customer 5) Catalogue customer 6) Customer 7) Diner beforehand 8) Diner choosing a dish 9) Drive-thru patron, at times 10) Emptor 11) Mail client 12) Man with a menu 13) Menu reader, eventually 14) One who gives commands 15) Purchaser 16) Restaurant customer at times 1) Systematiser 2) Systematizer 3) Systemiser 4) Systemizer 
• (n.) One who gives orders. • (n.) One who puts in order, arranges, methodizes, or regulates.
Or'der·er noun 1. One who puts in order, arranges, methodizes, or regulates. 2. One who gives orders. 
[n] - someone who places an order to buy 2. [n] - an organizer who puts things in order
systematizer noun an organizer who puts things in order; `Aristotle was a great orderer of ideas`