Which of the following words looks the same on half a turn?

Half a turn means a rotation of 180 degrees. If we rotate each of the options 180 degrees, only NOON will look exactly the same as before. N and O are among those English alphabets which look the same after half a turn.
The other options i.e BEAUTY, RICE and GOOD will be different on half a turn.  So the correct answer is NOON.
Therefore, option A is the correct answer.