Why is one group of random letters aligned in a row called a word when another group of random letters in a row not? Is it because someone says so or just because people actually use one set of aligned letters and not the other?

Probably a mixture of both those answers. What makes art art? And what makes art good art? One woman once said that my works are better than Picasso. It seemed that she was serious. Recently another person said that his 13 years old daughter paints better than me and that she is not even publishing her works in public. So what is the truth? Perhaps both opinions were truth for the person who said them. I think that the same applies to your made up words.