Tourist, traveler, and passenger are terms commonly used to describe individuals who engage in various forms of transportation and exploration. While there may be some overlap in their meanings, there are distinct differences between these terms.
A tourist is someone who travels to a different location for recreational or leisure purposes. Tourists typically follow planned itineraries, visit popular attractions, and often rely on tour guides or travel agencies for assistance. They may stay in hotels, resorts, or other accommodations tailored for tourists.
For example, a person visiting Paris to see the Eiffel Tower and Louvre Museum and staying in a centrally located hotel would be considered a tourist.

A traveler, on the other hand, is an individual who seeks unique experiences and cultural immersion while exploring new destinations. Travelers often have a more spontaneous approach to their journeys, immersing themselves in local customs, traditions, and interacting with the local population. They may venture off the beaten path, say in local guesthouses or homestays, and focus on authentic experiences rather than popular tourist attractions.
For instance, a person backpacking through Southeast Asia, staying in small villages, and trying local street food would be considered a traveler. A passenger is a more general term used to describe anyone who is on board a mode of transportation, such as an airplane, train, or bus.

Passengers typically have a specific destination in mind and are primarily concerned with getting from one place to another. They may be tourists, travelers, or individuals traveling for business purposes.
For example, a person taking a flight from New York to London for a business meeting would be considered a passenger.

In summary, tourists are individuals who engage in leisure travel and visit popular attractions, travelers seek cultural immersion and unique experiences, while passengers are more broadly defined as individuals traveling from one place to another. The terms reflect different motivations and approaches to travel and can help distinguish the purpose and mindset of individuals during their journeys.