Frederica rhymes with:
federica, roderica, billerica, federica, roderica, alarica, billerica, chandrika, costa_rica, enrica, eureka, farica, federica, fredericka, frederika, garnica, lamonica, lupica, luxottica, mika, modica, mojica, paprika, rebeka, rica, ricca, roderica, sica, topeka
Frederica sounds like:
fortier's, fortress, fortresses, forwarders, frederic, frederick, frederick's, fredericka, fredericks, frederico, frederika, fredric, fredrich, fredrick, fredricks, fridrich, friederich, friederike, friedrich, friedrichs, friedrick, furthers