Which word is the correct spelling. Grey or Gray , and Color or Colour.
Both spellings of grey/gray are correct. As for color and colour, the second one is the British spelling, the first is the American spelling.
All these words are correct in spelling. However, the meaning is also the same but only that they are spelled differently in the US and in UK. 'Grey' and 'color' are used in the US while 'gray' and 'colour' is in the UK grammar.
Both and both.
They are all correct my dear