This is the 11871st most frequent German word.
tierarzt
Veterinarian.
Here, 'Tierarzt' is used as a subject (der Tierarzt) of the sentence, representing the profession of a veterinarian.
Der Tierarzt untersucht mein krankes Haustier.
The veterinarian is examining my sick pet.
In this sentence, 'Tierarzt' is in the accusative form 'den Tierarzt' as the direct object of the action of visiting.
Ich werde heute den Tierarzt besuchen, weil mein Hund eine Impfung benötigt.
I will visit the veterinarian today because my dog needs a vaccination.
Here, 'Tierarzt' is used as a predicate indicating the profession my sister aspires to.