Retinoid rhymes with:
bioflavonoid, altoid, bioflavonoid, colloid, conchoid, ellipsoid, fibroid, geoid, haploid, negroid, placoid, tabloid, thyroid, typhoid
Retinoid sounds like:
radant, radiant, radmund, rationed, readmit, readmitted, red-handed, redeemed, redhanded, redmond, redmund, redondo, redound, retained, rhodanthe, rodent, rodmond, rodmund, rotondi, rotondo, rotund, rotunda, rotundo, rudiment, rudnet