Ancient Egypt question?

Hey peoples! So i need help on a question... What is it called in Ancient Egypt when theres a long period of rule, usually by the same family? My teacher has us doing a crossword pluzze in History and i cant figure out this last question... all i know is that its a 7 letters and its _y_a_ _ _ (all one word).. the question is again...long period of rule, usually by the same family Thank you for your help!