This is the 3211th most frequent German word.
erolzheim
"Erolzheim" is not a standard German word; it is a proper noun referring to a town in Baden-Württemberg, Germany.
Here, 'Erolzheim' is used as a proper noun indicating the name of a town.
Erolzheim ist ein kleiner Ort in Baden-Württemberg.
Erolzheim is a small place in Baden-Württemberg.
In this sentence, 'Erolzheim' is again a proper noun, referring to the location where someone's friend resides.
Mein Freund wohnt in Erolzheim und hat einen schönen Garten.
My friend lives in Erolzheim and has a beautiful garden.
In this case, 'Erolzheim' is used as the subject of reference about which the history is described.