Theme Words Program?

Does anyone know of an automated program that can provide theme words that are associated with a specific keyword or keyphrase?

The basic idea would be enter the keyword... hit submit and it throws out a 100 or so theme words that you can place into an article. Obviously this is doable with a thesaurus and synonyms but a standalone fast program would be way better.

Usually I write keywordword in semrush and get a list of similar words. Do you mean that?

kind of.

I found this program but not sure if its anygood or worth it. I just want an automated system that throws 50 themewords at any keyword so I can pass them on to the writers.

http://marketbold.com/ultimate-keyword-theme-extractor/