Symbion rhymes with:
colombian, columbian, zambian, albion, amphibian, arabian, barbian, caribbean, cobian, colombian, columbian, fabian, faubion, gibian, grobian, kasabian, lesbian, libyan, mehrabian, namibian, nubian, serbian, zambian
Symbion sounds like:
sampan, schoenbaum, shampine, shimbun, shinbein, shinbone, sinfonia, sniffen, sunbeam, symphony