Costra rhymes with:
bostra, astra, balestra, boonstra, bostra, dextra, dykstra, extra, feenstra, hamstra, heemstra, heidstra, hiemstra, hoekstra, hofstra, hukstra, hydstra, kamstra, kustra, lastra, maestra, nostra, olestra, orchestra, rienstra, spoelstra, telstra, terpstra, tuinstra, veenstra, westra, xtra, zandstra, zylstra
Costra sounds like:
cacciatore, cadre, caster, castor, castoro, castro, cater, caterer, cather, catheter, cedar, ceder, cestaro, cetera, chatter, chaudhry, cheater, cheddar, chester, chichester, chitra, chitrao, chitter, chodorow, chowder, chowdhury, cider, citro, coaster, coauthor, coder, coderre, cooter, costar, costeira, coster, coterie, cotter, cottier, couture, couturier, cowdery, cowdrey, cuadra, custer, cuter, cutrer, cutter, cytherea