\documentclass[]{article}
\usepackage{glossaries-extra}
\makeglossaries

\newglossaryentry{main}{
    name={main},
    description={Main entry}}

\newglossaryentry{alias}{
    name={Alias},
    description={\nopostdesc},
    alias={main}}

\begin{document}

    \printglossaries

\end{document}