der Abnehmer
buyer
A person or company that buys goods or uses a service; a customer or purchaser.
Für die neue Produktlinie gibt es bereits zahlreiche Abnehmer.
There are already numerous buyers for the new product line.

buyer / receiver
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buyer
A person or company that buys goods or uses a service; a customer or purchaser.
Für die neue Produktlinie gibt es bereits zahlreiche Abnehmer.
There are already numerous buyers for the new product line.

'Der Abnehmer' (buyer/receiver/pickup) is derived directly from the separable verb 'abnehmen' (to take off/accept/buy). It is the person or device that 'takes something from' someone—whether goods, a ball, or a signal.
Der Bauer verkauft seine Produkte direkt an die Abnehmer auf dem Markt.
The farmer sells his products directly to the buyers at the market.
The three meanings are clearly separated by context. If people are talking about business or trade, the buyer is meant. In a sports context, it is the receiver of a pass, and in technology it is a component.
Die Firma sucht neue Abnehmer in Asien.
The company is looking for new buyers in Asia.
In the meaning 'Käufer' (buyer), 'Abnehmer' is used especially in economic and business contexts. It sounds more formal and technical than the everyday word 'Kunde' (customer).
Große Supermarktketten sind die Hauptabnehmer für landwirtschaftliche Erzeugnisse.
Large supermarket chains are the main buyers of agricultural products.
The use in sports is technical jargon, especially in football/soccer. An 'Abnehmer' (receiver) is the player who is ideally positioned to receive and make use of a pass or cross.
Der Trainer forderte mehr Bewegung, um dem Passgeber Abnehmer anzubieten.
The coach called for more movement to offer the passer receivers.
customer
'der Kunde' and 'der Abnehmer' can both mean a person or company that buys something or uses a service. 'Kunde' is much more natural in everyday language and direct contact. It often suggests advice, service, or a business relationship. 'Abnehmer' sounds more factual and is often used when talking about quantities of goods, products, or a market. It emphasizes that someone takes or regularly buys the goods. The words can be confused because an 'Abnehmer' can also be a 'Kunde'. In a shop, you usually say 'Kunde'; in production and trade, 'Abnehmer' often fits.

Die Bäckerei sucht neue Abnehmer für ihre Brote in der Region.
The bakery is looking for new buyers for its bread in the region.
Zum besseren Service fragt das Team jeden Kunden nach seiner Meinung.
To provide better service, the team asks every customer for their opinion.