The font for description environment can be changed by using the \setsansfont in koma classes. Is there a way to be more specific, like \addtokomafont{disposition} is for headings?
[Tex/LaTex] Koma script description environment specific font
koma-script
Related Solutions
For fonts that are packaged for use with LaTeX, the Font Catalogue usually tells you how to use them.
If you specifically want to use FreeSans (which, as far as I know, has not been packaged for LaTeX), the easiest way is to use the fontspec package and XeLaTeX or LuaLaTeX.
% Compile with xelatex or lualatex.
\documentclass{article}
\usepackage{lipsum}% for testing
\usepackage{fontspec}
\setmainfont{FreeSans}
\begin{document}
\lipsum
\end{document}
I can think only of two reason not to use the KOMA-classes:
That you have a deadline and do not have the time to handle the problems involved with switching to another class.
That someone requires that you use another class (e.g. via a template).
Best Answer
See table 3.2 on page 55 in the English version of the KOMA-manual for a complete list of elements that can be changed with
\setkomafontor\addtokomafont.Here you'll find
So use e.g.
\addtokomafont{descriptionlabel}{...}.