A search of CPAN using "keywords" turns up a few modules that may help you in addition to the module suggested by dorward.

Better still why not simply parse the existing keywords within the "meta names keyword content" in the source code.

Someone has already taken the time to extract what the page is all about and listed them!

In reply to Re: relevant keywords from a website by Gavin
in thread relevant keywords from a website by pritchard12

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