You're still pushing $word onto @lessWords regardless of the match. Simple fix: 
foreach $word (@data)
{
        my @arr=split(/ /,$word);
        WORD:
        foreach $a (@arr)
        {
           foreach $stop (@stopwords)
           {
              next WORD if $a eq $stop;
           }
           push(@lessWords, $word);
        }
}

[download]
using a hash for @stopwords would make this code simpler and faster, though. There are some examples in this thread somewhere.

update: the above code is still buggy. See below for a much simpler version that should work.

"What should it profit a man, if he should win a flame war, yet lose his cool?"

In reply to Re^3: can you please fix the error by Joost
in thread can you please fix the error by zulqernain

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