in reply to Sorting doesn't seem to work

Your problem is here: 
my @string = join (" ",@words,@words2,@words3);  
print @string;

my @sortedwords = sort @string;
print "\n@sortedwords\n";

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Basically, @string contains one element. So, when you sort one element, you end up with a one element array, coincedentally in the same order as when you started.

If you want some help, a little context would be ... helpful. Things like:

Being right, does not endow the right to be rude; politeness costs nothing.
Being unknowing, is not the same as being stupid.
Expressing a contrary opinion, whether to the individual or the group, is more often a sign of deeper thought than of cantankerous belligerence.
Do not mistake your goals as the only goals; your opinion as the only opinion; your confidence as correctness. Saying you know better is not the same as explaining you know better.

In Section Seekers of Perl Wisdom