Rostuca rhymes with:
stuka, stuka, azuka, bazooka, colaluca, delduca, deluca, delucca, duca, huachuca, laduca, luca, lucca, luka, machuca, marchewka, maruca, mazzuca, molucca, otsuka, paducah, pagliuca, pokazukha, rabuka, sambuca, shinyuka, shizuka, sluka, stuka
Rostuca sounds like:
racists, rackets, racquets, ragtag, rastus, reacts, recedes, recites, regattas, rejects, requests, requisites, resets, resides, residues, resists, restage, restates, restock, rests, richts, rickets, ricketts, right's, righteous, rightish, rights, rights', rigidities, riksdag, roasts, rocket's, rockets, rockettes, roget's, rosettes, rosewood's, rushdie's, russets, rust's, rustic, rusts, rusty's, rustys