stopwords contain a list of stopwords,

That error means $stopwords is not declared (my or our). If you have a list of stop words, I presume it's in @stopwords rather than $stopwords? If so, you need a second loop to scan over your list of stop words.

WORD:
foreach $word (@data) { 
   foreach my $stopword (@stopwords) { 
      next WORD if $word eq $stopword;
   }

   push(@lessWords, $word);
}

print "@lessWords\n";

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Instead of using a second loop, you could speed up things greatly (if you have more than a couple of @words) by using a hash.

my %stopwords;

# Create an element in the hash for each stop word.
undef @stopwords{@stopwords};

foreach $word (@data) { 
   next if exists $stopword{$word};
   push(@lessWords, $word);
}

print "@lessWords\n";

[download]

In reply to Re: error:Global symbol "$stopwords" requires explicit package by ikegami
in thread error:Global symbol "$stopwords" requires explicit package by zulqernain

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