Hah, I wonder how thick a German, Dutch or Afrikaans dictionary would be if it included all possible spaceless compound words. Literally any concept can be compounded together to make a new word.

Roovleisslaghuisinspekteur =

Rooi = red

Vleis = meat

Slag = butcher

Huis = house

Inspekteur = inspector

"Inspector who controls the quality of red meat in butcheries"