Thanks to this macro
\makeatletter
\let\old@makechapterhead\@makechapterhead
\def\@makechapterhead{\def\thechapter{\words{chapter}}\old@makechapterhead}
\makeatother
\newcommand\words[1]{\expandafter\xwords\csname c@#1\endcsname}
\def\xwords#1{\ifcase#1\or
one\or
two\or
three\or
four\or
five\else
I need more words\fi}
which comes from this question "Literal" numbering of chapters
All feel well, and I obtain what I want in the first page of each chapter, "Chapter one", "Chapter two",...etc but in the table of contents, it uses the same numerotation of the chapters, so litteral, that I don't want, evidently. So how can I use the usual numbering (\arabic{chapter}) for the contents ?
