如何从左上角单元格删除 \toprule

Question

我怎样才能删除特定单元格上方的 \toprule？

\begin{table}[!htbp]
  \begin{center}
    \begin{tabular}{l l l}
      \toprule
       & column & column\\
      \midrule 
      row & word & longword\\
       & word & word\\
       & word & word\\
       & word & word\\
       &  & word\\
       &  & word\\
      \midrule 
      row & word & word\\
       & word & word\\
       & word, word & word\\
       & word & word\\
       & word & word\\
       &  & word\\
       &  & word\\
       &  & word\\
      \bottomrule 
    \end{tabular}
  \end{center}
\end{table}