The elements that start with the letter O are oxygen & Osmium.
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A few examples of 3-letter words starting with the letter O are:owloweoaroatown
Some six letter words starting with O are:objectoblongoccultocelotoddityoffendofficeorangeorioleorphanoverdooxygen
insects starting with letters O X and Z
octos
Outstanding is a nice word. It begins with the letter O.