In the Greek language, it is important to understand that the relationship of the noun to the other words in the sentence always governs the case. Hence, although Genitive and Ablative share the same endings, they are clearly distinguished within the context and function of the sentence. There are eight cases in the Greek language: Nominative, Genitive, Ablative, Dative, Locative, Instrumental, Accusative, and Vocative.
Vocative Case
The case of direct address.
The Nominative Case
The case of specific designation, the naming case.
The Genitive Case
The case of definition or description.
The Ablative Case
The case of separation.
The Dative Case
The case of personal interest. It expresses the indirect object.
The Locative Case
The case of position or location.
The Instrumental Case
The case of means or association.
The Accusative Case
The case of limitation or extension.