You are being thick. $word is a variable that's scoped to the generate_password() subroutine. Of course, you can't print it out. Try printing the value returned by calling the subroutine, as seen below:
#!/usr/bin/perl
{
my @words = qw( perl monk vroom );
my %convert = (
i => '!', e => '#', s => '%', o => ')',
);
sub generate_password
{
my $word = $words[rand @words] . $words[rand @words];
$word =~ s/(.)/$convert{$1} || $1/eg;
$word;
}
}
print generate_password(), $/;
------
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