A query. Any idea whether "data file" used by dictionary program or
spell-checker would be availbale somewhere in the web.

Hi Hari,

Have a look at the on-line version of Wordnet, and also look at the extra
possibilities in the secondary dropdown.

It seems you can download the entire application and database - and
interface with your own application!

http://wordnet.princeton.edu/

I hinted in your other post you have a mighty challenge to achieve your
goal, but a fascinating one. Cutting edge "AI" stuff, I think.

Regards,
Peter T