Concurrent vs. compétiteur
The French words concurrent and compétiteur are often used to describe competition but have nuanced differences in their meanings and usage.
Concurrent
B2Concurrent refers to someone or something that competes in a broad sense, and can be used for competitors in various domains, such as business, sports, or even abstract comparisons between ideas or entities.
Ce supermarché est un concurrent sérieux pour notre enseigne.
(This supermarket is a serious competitor for our brand.)
Les deux théories scientifiques sont concurrentes.
(The two scientific theories are competing.)
Les nouveaux modèles de téléphone portable sont des concurrents directs.
(The new smartphone models are direct competitors.)
Compétiteur
B1Compétiteur specifically refers to an individual or a team actively involved in a competition (usually sports, games, or contests) and typically implies direct, personal rivalry.
Le compétiteur a très bien joué pendant le tournoi de tennis.
(The competitor played very well during the tennis tournament.)
Chaque compétiteur doit respecter les règles du jeu.
(Each competitor must follow the rules of the game.)
Les compétiteurs étaient motivés pour remporter la médaille d'or.
(The competitors were motivated to win the gold medal.)
Summary
Concurrent is a broader term that refers to competitors in various contexts (commercial, ideas, products, etc.), while compétiteur is more specific to individual or team participants in direct contests or sports.