This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A person who orders, or who places an order

n. One who puts in order, arranges, methodizes, or regulates.

n. One who gives orders.

n. One who arranges, disposes, or regulates; one who keeps in order, or restores to order.

n. One who gives orders; one who orders or commands; a commander, ruler, or governor.

n. someone who places an order to buy

n. an organizer who puts things in order

"Within those are the individual notes, labelled with an "orderer" followed by a title: "a1 History", "a2 WWI"."

emptor    purchaser    buyer    vendee    organizer