German orthography
Compound words, including nouns, are written together, e.g. "Haustür" (Haus+Tür; house door), "Tischlampe" (Tisch+Lampe; table lamp), "Kaltwasserhahn" (Kalt+Wasser+Hahn; cold water tap/faucet). This can lead to long words: the longest word in regular use, "Rechtsschutzversicherungsgesellschaften" ("legal protection insurance companies"), consists of 39 letters; while the longest German word ever published ("Donaudampfschiffahrtselektrizitätenhauptbetriebswerkbauunterbeamtengesellschaft", "Association for subordinate officials of the head office management of the Danube steamboat electrical services") has 79 letters.
Plautdietsch language
The most problematic words are those with an -e plural ending in German. Although the entire class with no ending is made out of them, many other words are treated differently. For example, the plurals for Stool and Stock (chair and stick) are Steela and Stakja (compare German Stuhl, Stühle; Stock, Stöcke). Since they have their vowels fronted there seems to be no reason for the -a ending. Many others have been moved into the -en class: Jeboot, Jebooten (commandment/s, German: Gebot, Gebote). With some not so common words, there is no certainty about the correct plural, different speakers create them in different ways: the plural of Jesaz (law) could be Jesaza or Jesazen (German: Gesetz, Gesetze).