Conchoid rhymes with:
altoid, bioflavonoid, colloid, ellipsoid, fibroid, geoid, haploid, negroid, placoid, retinoid, tabloid, thyroid, typhoid
Conchoid sounds like:
canasta, canoeist, canonized, canwest, changed, chemist, chengdu, cinched, cincotta, coincide, coincided, comcast, commenced, communicate, communicated, communist, comsat, concede, conceded, conceit, conceited, conchita, concoct, concocted, congest, congested, conjugate, conjugated, connaught, connect, connected, conquest, consist, consisted, constitute, constituted