Gerdes' rhymes with:
gerdes, bird's, birds, birds', byrd's, gerdes, girds, herds, kurds, nerds, n_words, third's, thirds, twothirds, word's, words
Gerdes' sounds like:
garret's, garrets, garrett's, gartzke, garuda's, geerdes, geerts, gerdes, gerdts, gerrits, gertsch, gertz, geurts, gewirtz, girds, goertz, goradze, gordji, gordy's, gorrids, gourds, gradco, grades, grads, graduates, gradus, graetz, grates, gratis, gratuities, gratuitous, gratz, great's, greathouse, greats, greets, greitz, greta's, gretz, gretzky, grid's, grids, grites, grits, gritz, grodsky, grotesque, grothaus, grotz, growth's, growths, grudge, grudges, guard's, guards, gurtz, gyrates