Which of the following nouns is NOT of the 1st declension?

The noun "Magister" is not classified as a 1st declension noun; instead, it belongs to the 2nd declension in Latin. The 1st declension primarily includes nouns that are feminine and typically end in "-a" in the nominative singular form. Examples of 1st declension nouns include "Agricola" (farmer) and "Nauta" (sailor), both of which adhere to the patterns of the 1st declension.

On the other hand, "Magister" (teacher or master) is a masculine noun and follows the 2nd declension pattern, which includes nouns ending in "-us" in the nominative singular. "Pirata" (pirate), while it does follow a similar structure to 1st declension nouns, is often treated as a 1st declension noun in usage patterns due to its feminine form in plural contexts.

Understanding the declension classifications is essential for recognizing noun endings and grammatical gender in Latin, helping learners correctly decline nouns based on their forms.