IPA: /ˌrɛstəˈrɒntə/
KK: /ˌrɛstəˈrɒntɜr/
A person who owns or manages a restaurant, responsible for its operation and success.
The restaurateur decided to open a new Italian restaurant in the city.
Restauranteur → It is formed from "restaurant" (from French *restaurant*, meaning a place that restores or refreshes) and "-eur" (a suffix used in French to denote a person who performs a specific action). A restauranteur is a person who owns or manages a restaurant, a place that restores or refreshes through food.
Think of a 'restaurant' as a place that 'restores' you with food, and the '-eur' means a person who does that. So, a restauranteur is someone who provides that restorative experience.
No commonly confused words.