This is the 10750th most frequent German word.
rostow
"Rostow" is not a German word; it is a surname or reference to the Russian city "Rostov."
Here, 'Rostow' is a proper noun referring to a geographical location.
Rostow ist eine Stadt in Russland.
Rostow is a city in Russia.
In this sentence, 'Rostow' refers to a person (perhaps an author).
Haben Sie das Buch von Rostow gelesen?
Have you read the book by Rostow?
Here, 'Rostow' symbolizes an origin of thought or a person whose ideas are being referenced.