pawnee: a member of the Pawnee nation formerly living in Nebraska and Kansas but now largely in Oklahoma
entity: that which is perceived or known or inferred to have its own distinct existence (living or nonliving)
oxygen: a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust