Nearly there, as far as I can see

• 'keys' is a keyword/function in this contect, not a variable, so 'keys' not '$keys'
• '==' is numeric, not string - use 'eq'
• See revised code below for your hash refs

foreach my $keyLOOK(keys %UnNum){
        foreach my $word(@midWords){
            if $word == $keyLOOK {
            $UnNum{$keyLOOK}++;
            }
        }
}
[download]

Or, alternatively..

foreach(keys %UnNum){
        foreach my $word(@midWords){
            if $word eq $_ {
            $UnNum{$_}++;
            }
        }
}
[download]

Tom Melly, tom@tomandlu.co.uk

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