
der Starter
participant
A person who takes part in a competition, especially a race.
Beim diesjährigen Marathon gab es über zehntausend Starter.
At this year's marathon, there were over ten thousand participants.
starter / appetizer
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participant
A person who takes part in a competition, especially a race.
Beim diesjährigen Marathon gab es über zehntausend Starter.
At this year's marathon, there were over ten thousand participants.

appetizer
An appetizer; a small first course of a meal.
Als Starter nehme ich einen gemischten Salat.
For my appetizer, I'll have a mixed salad.

starter
The person who gives the official starting signal at a competition, e.g. a race.
Die Läufer warteten nervös auf den Schuss des Starters.
The runners waited nervously for the starter's shot.

starter
A device for starting an engine, especially the starter motor in a vehicle.
Das Auto springt nicht an, ich glaube, der Starter ist kaputt.
The car won't start; I think the starter is broken.

starter
A culture of microorganisms (yeast and bacteria) used to make sourdough for bread.
Ich muss meinen Starter füttern, damit ich morgen Brot backen kann.
I need to feed my starter so I can bake bread tomorrow.
The word is derived from the verb 'starten' (to start). The ending '-er' indicates that it is a person or thing that performs an action — so someone or something that starts or starts something.
Der schnellste Starter gewann das Rennen.
The fastest starter won the race.
Because 'Starter' (starter / appetizer) has many meanings, context is crucial. Watch for signal words: 'Rennen' (race) or 'Wettkampf' (competition) (person), 'Menü' (menu) or 'bestellen' (to order) (food), 'Auto' (car) or 'Motor' (engine) (technical), and 'backen' (to bake) or 'Sauerteig' (sourdough) (bread).
Im Restaurant bestellte er einen Salat als Starter.
In the restaurant, he ordered a salad as an appetizer.
In this meaning, 'der Starter' (the participant) is a person who takes part in a competition. People often speak of the 'Anzahl der Starter' (number of participants) or a 'Feld von Startern' (field of participants).
Bei dem Rennen waren über fünfzig Starter gemeldet.
Over fifty participants were registered for the race.
The use of 'Starter' for 'Vorspeise' (appetizer) is modern and is often used in restaurants with international cuisine. It sounds a bit trendier than the classic German word.
Auf der Speisekarte stehen drei verschiedene Starter zur Auswahl.
There are three different appetizers to choose from on the menu.
In a sports context, you need to listen carefully: 'Der Starter' can mean the participant (meaning m01), but also the person who gives the starting signal. The latter is often made clear by the action: 'Der Starter hebt die Pistole' (the starter raises the pistol).
Alle Läufer blickten gespannt zum Starter.
All the runners looked expectantly toward the starter.
In a baking context, a sourdough starter is used with specific verbs. You can 'einen Starter ansetzen' (start a starter), 'füttern' (feed it with flour and water), or 'auffrischen' (refresh it).
Bevor du backen kannst, musst du den Starter aus dem Kühlschrank nehmen und füttern.
Before you can bake, you have to take the starter out of the fridge and feed it.
participant
Teilnehmer is the general term for a person who takes part in an event or competition. Starter refers to a participant in a competition and is used especially for races. In a race, both words are therefore often possible, but Starter emphasizes starting in the competition.

Jeder Starter des Rennens bekommt eine Nummer.
Every competitor in the race gets a number.
Jeder Teilnehmer des Sportfestes bekommt eine Nummer.
Every participant in the sports festival gets a number.