• freat plains of north america,
• vreat plains of north america,
• breat plains of north america,
• hreat plains of north america,
• yreat plains of north america,
• treat plains of north america,
• geeat plains of north america,
• gdeat plains of north america,
• gfeat plains of north america,
• gteat plains of north america,
• g5eat plains of north america,
• g4eat plains of north america,
• grwat plains of north america,
• grsat plains of north america,
• grdat plains of north america,
• grrat plains of north america,
• gr4at plains of north america,
• gr3at plains of north america,
• grezt plains of north america,
• grest plains of north america

The adjective form of "Great Plains of North America" is "Great Plains".