List of Words for Letter 'O'
Click on 
to hear the word and definition
-
observe
to use your senses to learn about an object or event
-
ocean
a large body of salt water
-
opaque
unable to let light pass through
-
orbit
the path an object takes as it travels around another object
-
ornithologist
a scientist who studies birds
-
outer planets
the five planets farthest from the Sun
-
oxygen
a common gas found in air and water that many animals need to survive