The Arapaho language ( also Arapahoe ) is a Plains Algonquian language ( an areal rather than genetic grouping ) spoken by elders in Wyoming . The Arapaho language or hinono ` eitiit ( also `` Arapahoe Language '' and hiinonoei ` tiit ) is a Plains Algonquian language ( an areal rather than genetic grouping ) spoken almost entirely by elders in Wyoming , and to a much lesser extent in Oklahoma .