* Dictionaries are organized alphabetically. So, a word would appear *between* "rose" and "rough" if it came alphabetically later than "rose" but earlier than "rough".
* There's no way to know for sure what word wouldn't appear. There are countless words in the English language.
To make this into a more solvable puzzle, we'd need more constraints. For example:
* A word of a certain length.
* A word starting with a specific letter.
* A word from a specific subject area.
Let me know if you'd like to try a different version of this puzzle!