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Oh, I found my error. Your test file totally works fine.
I had a faulty bold version of my used font. Sorry for the inconvenience
and many thanks for the fast help ...

Many thanks it works fine! But if I use the new command in a section or subsection title
the text is printed in the default font. In the table of contents however the font of
the subsection titles are printed in the correct font, but in the real document the default
font is used. The font of the ...

Hi,

I have a document where I use a specific definition to put a specific word always in
another font: i.e.:

\usepackage[T1]{fontenc}
\def\bubu{{\renewcommand{\rmdefault}{pfu}\textrm{bubu}}}

I then use \bubu in the body text to get the word bubu in the preferred font.
This works fine, but it ...