There isn't a spelling rule. :( It's a matter of the history of English:Originally Posted by mellypuss
There's one word I know of that doesn't have 'u': qwerty, (1926), from the first six keys on a standard typewriter keyboard. There's also Qatar, which isn't an English word.Originally Posted by etymology online
Here's a great online dictionary: Click Here. It has entries for bot and qua, but not for wiv.
All the best, :D