First, Wiktionary::Parser has few dependencies that need to updated before you install the parser. In a nutshell:

#!/usr/bin/perl

use strict;
use warnings;
use CPAN;

my (@mods) = qw(
    File::Path
    Text::Unidecode
    JSON
    WWW::RobotRules
    HTTP::Cookies
    Net::FTP
    Net::HTTP
    IO::Socket
    HTTP::Daemon
    Digest::MD5
    HTML::Tagset
    XSLoader
    HTML::Entities
    HTTP::Negotiate
    File::Listing
    Time::Local
    HTTP::Date
    Bundle::Compress::Zlib
    File::Temp
    Exporter
    Scalar::Util
    IO::HTML
    IO::Uncompress::Inflate
    HTTP::Status
    Encode
    Encode::Locale
    LWP::MediaTypes
    Test
    MIME::Base64
    URI::EScape
    LWP::UserAgent
    MediaWiki::API
    Carp
    Spiffy
    ExtUtils::MakeMaker
    Filter::Util::Call
    Test::More
    Test::Base
    Test::CheckManifest
    Carp::Always
    Locale::Codes
    Wiktionary::Parser
);

foreach my $mod (@mods) {
    CPAN::Shell->install($mod);
}
[download]

Second, don't forget to use a dumper. I used Data::Dumper::Concise. Using your script, I use derived_terms and synonyms:

#!/usr/local/bin/perl -l

use strict;
use warnings;
use Wiktionary::Parser;
use Data::Dumper::Concise;

my $parser = Wiktionary::Parser->new();

my $document      = $parser->get_document( title => 'bunny' );
my $derived_words = $document->get_derived_terms();
my $synonyms      = $document->get_synonyms();
print Dumper( $derived_words, $synonyms );
[download]

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