Symbion's rhymes with:
colombians, columbians, amphibians, arabians, colombians, columbians, gibian's, lesbians, libyans, serbian's, serbians
Symbion's sounds like:
sampans, semifinish, signifying, skimping, snapping, sniffing, sniping, snooping, snubbing, snuffing, succumbing, sunbeam's, swamping, symphonic, symphonies, symphony's