Melatonin's rhymes with:
melatonins, melatonins, melatonins, melatonins, melatonins, melatonins, dornan's, kalnins, lenin's, melatonins, pecanins, pecanins'
Melatonin's sounds like:
malleton's, malting, maulding, melatonins, melding, meldons, melting, militancy, miltonic, mladenic, molding, moldings, molting, moulding, mouldings, multiethnic