A semite IS an arab. Don’t confuse arab with Muslim. I could be wrong since I’m going from memory, but even ashkenazi Jews (central European) aren’t really semetic by definition. The truly semetic jews are the sephardics and I think two other tribes. But again, I’m going from memory here and “semetic” has taken on a different meaning over the years.
The “central European” Jews emigrated from the mideast following the destruction of the second temple, but due to genetic laws, and separation from gentiles, they maintained their ethnic continuity to a remarkable degree