Gray and grey are both common spellings for the various neutral shades of color between black and white. Gray is more frequent in American English, and grey more common in Canada, the UK, and elsewhere.
"Gray" and "grey" are both correct spellings of the word for the neutral or achromatic color—a color “without color" between black and white, like a cloud-covered sky, ashes, or lead.
Both gray and grey are used to refer to the color between black and white. The main difference between the two spellings is primarily their usage in language: gray is more common in American English, while grey is more frequent in British English.
Grey or Gray: When to Use Gray or Grey with Useful Examples - 7ESL
Speaking of gray or grey, another confusing word with two spellings is color and colour. Use color for the American spelling, and use colour for the British spelling.
The words Gray and Grey might sound the same, but have different meanings and different spellings. In this Grammar.com article, you will learn the differences between these two confusing words.
Gray or Grey? The spelling 'gray' dominates in the US, but 'grey' is acceptable there. The reverse is true in the UK. 'Grey' is the original spelling, so both the US and UK accept it.
The correct spelling of the neutral color that exists between black and white can be “grey” or “gray,” with “grey” being more common in British English and “gray” being the preferred spelling in American English.