> foreach($kywrd as $val) {
>  $fndWrds .= "wrd = '$val' OR ";
> }

FYI, a simpler way to do that...

$fndWrds = "wrd IN ('" . implode("','", $kywrd) . "')";

That aside, w/o completely analyzing your entire set of code, it sounds 
like John is on the right track with putting a unique index on the wrd 



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