Splain rhymes with:
explain, splaine, champlain, complain, explain, plain, plane, splaine, ahlen, alain, alaine, alane, alayne, allain, blain, blaine, blane, blayne, champlain, charlayne, complain, delaine, elaine, elane, elayne, explain, galane, helane, lain, laine, lane, layne, ln, maclaine, maclean, mcclain, mcclaine, mcclane, mclain, mclane, plain, plane, slain, slaine, slane, splaine, tulane
Splain sounds like:
sabalan, sablan, schieffelin, scopolamine, sephlon, shevlin, shovlin, sjoblom, sobelman, spallone, speelman, spellman, spelman, spielman, spielmann, spillane, spillman, spilman, splaine, splawn, spleen, sublime