Glad to help. As for your next question, is this what you're after?

      abel appears  0 times in  0 files (not counting al.txt)
     baker appears  1 times in  1 files (not counting al.txt)
    camera appears  1 times in  1 files (not counting al.txt)
     delta appears  2 times in  1 files (not counting al.txt)
    edward appears  1 times in  1 files (not counting al.txt)
     fargo appears  4 times in  4 files (not counting al.txt)
    golfer appears  2 times in  2 files (not counting al.txt)
     jerky appears  3 times in  3 files (not counting al.txt)
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If so, try the following code somewhere below the call to read_words():

my $name = 'al';
for my $kw (sort keys $name{$name}) {
    my $files = -1 + keys $kw{$kw}; # Do not include original file

    my $count = -$kw{$kw}->{$name};
    $count   +=  $kw{$kw}->{$_} for keys $kw{$kw};

    printf "%10s appears %2d times in %2d files (not counting %s.txt)\
+n",
            $kw,         $count,      $files,                 $name;
}
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I confess I really don't see what you're trying to do with the $filelist{$max+1} stuff. If I'm off the mark, above, might I suggest you post some specific sample output you'd like to see, given the original inputs. Pseudo code is fine, but not if we don't know what it's supposed to look like. :-)