It's not that simple Dexter. A Holocaust has a specific meaning, it's the deliberate and systematic attempted annihilation of a group of people from the face of the planet. It's not clear that that's what was attempted with the Armenians although they were mass-murdered wholesale.
For instance, killing a group of people because of their suspected disloyalties to a country is not genocide because the main purpose of killing them was not to rid the earth of their kind, but instead to suppress political liabilities.
Germans wanted to destroy every Jew on the planet, they even wanted to come to Israel and kill the Jews there, the same Genocidal intent isn't so clear with the Armenian "genocide".