Ethnic cleansing is the explosion of an ethnic group from a geographical area. The Nazis did not attempt to ethnically cleanse Europe of Jewish, Romani, Slavic, etc people.
Genocide is the act of destroying an ethnic group via destruction of individuals of that group. The Nazis did attempt to commit genocide against Jewish, Romani, Slavic, etc people.
Ethnic cleansing is the explosion of an ethnic group from a geographical area. The Nazis did not attempt to ethnically cleanse Europe of Jewish, Romani, Slavic, etc people.
Genocide is the act of destroying an ethnic group via destruction of individuals of that group. The Nazis did attempt to commit genocide against Jewish, Romani, Slavic, etc people.