I am sorry but I am a picky Australian virgo, gray is not a word in my vocabulary. Maybe it is someone's name, it is not a colour, just like meter is something you put money in, but does not measure up like a metre does.
I too had an argument with a teacher about meter and metre, I don't trust them any more.
I never noticed theatre and theater.
And I hate it when I make typos because I don't make spelling mistakes!