Fredericks rhymes with:
frederick's, fredricks, frederick's, fredricks, dederichs, frederick's, fredricks, dederichs, deedrick's, frederick's, fredricks, friedrichs, hendricks, hendriks, hendrix, hendryx, kendricks, roderick's
Fredericks sounds like:
fortier's, fortress, fortresses, forwarders, frederic, frederica, frederick, frederick's, fredericka, frederico, frederika, fredric, fredrich, fredrick, fredricks, fridrich, friederich, friederike, friedrich, friedrichs, friedrick, furthers