删除其中包含特定字符串的行

Question

    difer        
0   0.11, word;; 12          
1   NaN          
2   01_00532      
3   NaN           
4   0.11, word;; 13443           
5   0.10          
6   Nan           

如果要输入的列包含特定字符串（在本例中为“单词”），我想删除它。

i found this answer but didnt know ho to apply it correctly