der Tourist
tourist
A person who travels to another place for pleasure, relaxation, or cultural interest and stays there temporarily.
Im Sommer sind die Straßen der Stadt voller Touristen.
In summer, the city's streets are full of tourists.

tourist
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tourist
A person who travels to another place for pleasure, relaxation, or cultural interest and stays there temporarily.
Im Sommer sind die Straßen der Stadt voller Touristen.
In summer, the city's streets are full of tourists.

'Der Tourist' (the tourist) belongs to the N-declension. This means that the noun takes the ending '-en' in all cases except the nominative singular. Learners often make mistakes with this.
Der Reiseführer spricht mit dem Touristen.
The tour guide is speaking with the tourist.
The word 'Tourist' (tourist) is part of a word family related to travel. It is directly related to 'Tour' (tour) and 'Tourismus' (tourism). The ending '-ist' always refers to a person who carries out a particular activity.
Der Tourismus ist für diese Region sehr wichtig.
Tourism is very important for this region.
'Tourist' (tourist) is often combined with adjectives that describe origin, e.g. 'deutsche Touristen' (German tourists) or 'asiatische Touristen' (Asian tourists). Quantity expressions such as 'viele Touristen' (many tourists) or 'einzelne Touristen' (individual tourists) are also very common.
Im Sommer kommen viele amerikanische Touristen nach Berlin.
In summer, many American tourists come to Berlin.
guest
'der Gast' and 'der Tourist' can both mean a person who is only temporarily in a place. 'Gast' fits when someone is invited or is being served in a hotel, restaurant, or at an event. 'Tourist' is used when someone travels in order to visit a place, relax, or see something. So a tourist can be a guest in a hotel. The words can be confused when talking about travel: in a hotel, people often say 'Gast'; in a city or when sightseeing, 'Tourist' is more likely to fit.

Vor dem Museum fotografiert ein Tourist die alte Fassade.
In front of the museum, a tourist takes a photo of the old facade.
Der Kellner bringt dem Gast am Fenster die Speisekarte.
The waiter brings the menu to the guest by the window.