Identify important less frequent words I have set of newspaper articles. I want to identify important less frequent words in the set of newspaper articles. Currently I am using TF-IDF scores. However, it does not seem to be a good metric in my problem. Is there any better way of doing this?

Thank you in advance :)
You could try looking just at the IDF scores. Things like names/entities will score high, this may be desirable or undesirable depending on what you want.