Anyhow ... suppose you were faced with that problem ... only being able to use the first half of the German alphabet. There would be shed-loads of words you couldn't make.
All you could use would be .....
A B C D E F G H I J K L M
and NOT ......o p q r s t u v w x y z ( we'll assume that ß=ss)
There's quite a few 2-letter words .... ab, am, ja for a start.
There's some 3-letter words .... mal springs to mind for example.
4-letter words....
So , dear readers .... [a] what else can you make ?
[b] would you be better off with the other half ?
While you think about that, here's Astra Kid with "Für etwas mehr als dich"