This code seems to be very difficult to use. First of all, it's in the wrong namespace, since it is only for English. Secondly, for whatever reason, it requires a MySQL database. The documentation only really describes how to make the MySQL database and says nothing about how the dictionary works or what algorithm might be used to decide a rhyme.
It's also rather a self-indulgent use of CPAN disc space (four megabytes of dictionaries are included in the distribution).
This module seems poorly-designed, self-indulgent and a waste of space.