Seaboard rhymes with:
keyboard, aboveboard, baseboard, billboard, blackboard, cardboard, checkerboard, chessboard, chipboard, clapboard, clipboard, containerboard, dartboard, dashboard, fiberboard, fibreboard, fingerboard, floorboard, hardboard, headboard, inboard, keyboard, linerboard, mopboard, onboard, outboard, overboard, paperboard, pegboard, plasterboard, pressboard, scoreboard, shipboard, skateboard, smorgasbord, snowboard, springboard, storyboard, surfboard, switchboard, wallboard, washboard
Seaboard sounds like:
safford, safrit, saporito, savard, savored, scabbard, schaffert, schappert, schobert, schubert, seabert, seaford, seaport, sebert, seibert, seifert, seiffert, seifried, seivert, separate, separated, seubert, seufert, sevareid, severed, severity, severt, seybert, seyfarth, seyfert, seyfried, shavord, shepard, sheperd, shephard, shepheard, shepherd, shepherded, sheppard, shepperd, shipboard, shipyard, shivered, shobert, shubert, shuford, shupert, sibert, siebert, siefert, siegfried, sievert, sifford, sigfreda, skipworth, sobered, sobriety, spafford, spared, sparred, sparta, spearhead, spearheaded, sperduto, spheroid, spirit, spirited, spirito, spofford, sport, sported, sporty, spratt, sprayed, spread, sprite, sproat, sprott, sprout, sprouted, spurred, spurt, spurted, subroto, subvert, subverted, suffered, superdot, superheated, superiority, support, supported, swafford, swofford, sybert, syfert