
der Mitspieler
teammate
A person who takes part in the same game, sport, or activity, often on the same team.
Er passte den Ball zu seinem Mitspieler vor dem Tor.
He passed the ball to his teammate in front of the goal.
teammate / fellow player
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teammate
A person who takes part in the same game, sport, or activity, often on the same team.
Er passte den Ball zu seinem Mitspieler vor dem Tor.
He passed the ball to his teammate in front of the goal.

player
In a figurative sense, a person, company, or organization that plays an active role in a particular area, such as business or politics.
Neben den etablierten Autoherstellern gibt es neue Mitspieler auf dem Markt für Elektromobilität.
Alongside the established car manufacturers, there are new players in the electric mobility market.
The word is made up of the preposition 'mit' (with) and the noun 'Spieler' (player). So it literally means a person who 'mitspielt' (plays along/participates). This structure is very logical and easy to understand.
Im Team ist es wichtig, gut mit seinen Mitspielern zu kommunizieren.
In a team, it is important to communicate well with your teammates.
The prefix 'Mit-' always expresses community or doing something together. You find it in many words such as 'Mitschüler' (classmate) or 'Mitbewohner' (roommate/flatmate).
Genau wie ein „Mitschüler“ mit dir lernt, spielt ein „Mitspieler“ mit dir im selben Team.
Just as a 'Mitschüler' (classmate) learns with you, a 'Mitspieler' (teammate) plays with you on the same team.
In business or political contexts, 'Mitspieler' (player) is used for companies or actors that are active in a particular field. It is a metaphor that presents the market as a kind of playing field.
Apple und Google sind wichtige Mitspieler auf dem Smartphone-Markt.
Apple and Google are important players in the smartphone market.
participant
Teilnehmer generally refers to any person who takes part in a game, sport, or activity. Mitspieler emphasizes that the person is involved in the same game or activity as someone else, often even on the same team.

Jeder Mitspieler in meiner Fußballmannschaft erhält eine Urkunde.
Every teammate on my soccer team receives a certificate.
Jeder Teilnehmer des Fußballturniers erhält eine Urkunde.
Every participant in the soccer tournament receives a certificate.