Diaspora: Diaspora refers to the dispersion or scattering of a particular group outside their traditional homeland. In relation to Judaism, it specifically describes Jewish communities living outside Israel.
Zionism: Zionism is a political movement advocating for the establishment and support of a Jewish state in Palestine (later becoming modern-day Israel).
Refugee: A refugee is someone who has been forced to flee their home due to fear of persecution or violence. Jewish migrants escaping Nazi persecution during WWII can be considered refugees.