ουρανος
Ouranos is the Greek word for "sky" - often taught to budding Hellenics as one of the first words. The sounds required are easy, and the word sticks in your memory.
Composed of Omicron, upsilon, rho, alpha, nu, omicron and sigma, although being sigma at the end of a word requires the special "final" sigma. Compare the ordinary sigma σ to the final letter sigma ς