That Britannica uses the term is indeed confirmation that the term exists however I m not seeing justification for it to be a separate topic It might be worth making something like a Wiktionary definition that Mongol Nation refers to the loose confederation of tribes that existed during the time of Genghis Khan before the Empire started its major expansion Or we could maybe add a couple sentences to that effect in the Mongol Empire article as a subsection and then have Mongol Nation be a deep redirect to Mongol Empire Mongol Nation But I don t believe there s enough here for a separate article