This is the 7529th most frequent German word.
gothaer
"Gothaer" refers to something or someone from Gotha, a city in Germany; it is also the name of an insurance company.
In this sentence, 'Gothaer' refers to a proper noun, specifically the name of an insurance company, and is used as a singular noun to denote the entity.
Die Gothaer ist eine bekannte Versicherungsgruppe in Deutschland.
The Gothaer is a well-known insurance group in Germany.
Here, 'Gothaer' is used as an adjective modifying 'Versicherung,' effectively denoting the insurance services associated with the Gothaer company.
Wo finde ich Informationen über die Gothaer Versicherung?
Where can I find information about the Gothaer insurance?
In this case, 'Gothaer' is again used nominally as a proper noun to reference the organization directly.