Thesaurus mapping many to one. That is indeed where I expect the best possibilities. A thesaurus that includes multiword phrases, up to sentences. I was thinking of a database that just stores all sentences it encounters, minus some pre-storage streamlining via stemming and problem domain jargon identification.

But I know from experience that it is easier to talk about it than to implement useful code :)

I must look better at the Lingua:: stuff; it will take some time. It seems that most of it is word-, not phrase- or sentence-based (as I was hoping).

Thanks. I will let you know what I find.