Radant rhymes with:
abundant, accident, antecedent, antioxidant, ardent, ascendant, attendant, coincident, confident, corespondent, correspondent, couldn't, decadent, decedent, defendant, dependent, descendant, descendent, despondent, didn't, discordant, evident, hadn't, imprudent, incident, independent, interdependent, mordant, needn't, nonresident, overconfident, overdependent, oxidant, pendant, precedent, provident, prudent, redundant, resident, resplendent, respondent, retardant, rodent, self-confident, shouldn't, strident, student, superintendant, superintendent, transcendent, trident, verdant, vice-president, wouldn't
Radant sounds like:
radiant, radmund, rationed, readmit, readmitted, red-handed, redeemed, redhanded, redmond, redmund, redondo, redound, retained, retinoid, rhodanthe, rodent, rodmond, rodmund, rotondi, rotondo, rotund, rotunda, rotundo, rudiment, rudnet