Spong rhymes with:
pong, along, aung, belong, chong, cong, cuong, dejong, dejonge, dejongh, delong, dong, fong, gong, guangdong, hmong, hong, hong-kong, jong, kong, kwong, kyong, kyoung, lifelong, long, luong, maung, mong, ong, phuong, pong, prolong, prong, pudong, quang, rong, sarong, see-kiong, song, sprong, stong, strong, thong, throng, tong, truong, vietcong, vong, vuong, wong, wrong, xiong, xudong, xuedong, yearlong, yong, yuzong, zedong
Spong sounds like:
sabine's, sabins, safing, saipan's, sapanski, sapiens, sapienza, sapping, savannas, savin's, saving, savings, savings', savings's, saxophones, scavenge, scooping, scoping, sczepanski, seeping, seven's, sevens, shaping, shaving, shavings, shipping, shobana's, shobanna's, shopping, shopping's, shoving, shuping, sieving, siphoning, siphons, sipping, skibinski, skipping, skyhopping, sobbing, sofians, sopping, soybeans, spain's, span's, spang, spanish, spank, spanky, spanning, spanos, spans, spawning, spawns, spence, spens, spewing, sphinx, spiffing, spinach, spines, spink, spinks, spinks's, spinning, spinosa, spinoza, spins, sponge, sponges, spongy, spoofing, spoons, spunk, spunky, spying, subbing, subpoenaing, subpoenas, supinski, suspense, svensk, svenska, swapping, sweeping, swiping, swooping, sypniewski, szczepaniak, szczepanik, szczepanski