Latex trent bei mir leider Vanillezucker so: Vanillezu-cker
//Huebi

\documentclass{article}
\usepackage[ngerman]{babel} 
\begin{document}
\parbox{2.8cm}{Etwas Vanillezucker}
\end{document}\documentclass[german]{article}
\usepackage[german]{babel}
\begin{document}
\parbox{2.8cm}{Etwas Vanillezu"cker}
\end{document}
%!TEX lualatex
\documentclass{article}
\usepackage[ngerman]{babel}
\babelposthyphenation{ngerman}{ck}{
  { no = c, pre = k- },
  {}
}
\begin{document}
\parbox{2.8cm}{Etwas Vanillezucker}
\end{document}\babelposthyphenation{german}
  { [AEIOUÄÖÜaeiouäöü] (```
) ([kK]) [AEIOUÄÖÜaeiouäöü] }{
    {},                        % Keep first vowel
    { no = {1}, pre = {2}- },  % c or C → discretionary
    {},                        % Keep k or K             
    {}                         % Keep second vowel
}
```\documentclass{article}
\usepackage[ngerman]{babel}
\begin{document}
\parbox{2.8cm}{Etwas Vanille\discretionary{zuk-}{ker}{zucker}}
\end{document}zwei Tütchen Vanillezucker
\qty{2}{\ingutl} Vanillezucker
