1.emigration, migration and immigration
2. epidemic, endemic and pandemic
#1 >> words - UsingEnglish.com ESL Forum
#2 Presumably the medical terms:
Endemic = relating to disease that is constantly present, to greater or lesser extent, in a particular locality [from Greek "endemios" = native [en = in; demos = the people]
Epidemic = a widespread occurrence of an infectious disease in a community at a particular time [from Greek [epi = among; demos = the people]
Pandemic = (of a disease) prevalent over a whole country or large part of the world. [from Greek [pan=all; demos=the people].