Retained rhymes with:
detained, abstained, ascertained, attained, contained, detained, entertained, maintained, obtained, pertained, self-contained, stained, sustained, unstained
Retained sounds like:
radant, radiant, radmund, rationed, readmit, readmitted, red-handed, redeemed, redhanded, redmond, redmund, redondo, redound, retinoid, rhodanthe, rodent, rodmond, rodmund, rotondi, rotondo, rotund, rotunda, rotundo, rudiment, rudnet