Common Words:
* Drama
* Pasta
* Salsa
* Camera
* Sofa
* Mafia
* Pizza
* Llama
Less Common Words:
* Chara (a character in a story)
* Fata (a fairy)
* Planta (a plant)
* Persona (a person's social facade)
* Trivia (unimportant details)
* Ninja (a Japanese warrior)
Proper Nouns:
* China
* Asia
* Mona (a common female name)
* Cuba
Other:
* Circa (around)
* Et cetera (and so on)
This is just a small sample, there are many more words that end in "a"!