Customer
Part of speech: noun
Definition: a patron; one who purchases or receives a product or service from a business or merchant, or plans to A person of a particular kind, as in cool customer, tough customer, ugly customer.
Example sentence: Innovation comes from the producer - not from the customer.
Client
Part of speech: noun
Definition: A customer a buyer or receiver of goods or services.The role of a computer application or system that requests and/or consumes the services provided by another having the role of server.Person who receives help or advice from a professional person (ex. a lawyer, an accountant, a social worker, a psychiatrist, etc).
Example sentence: Junk is the ideal product... the ultimate merchandise. No sales talk necessary. The client will crawl through a sewer and beg to buy.