Caffeinated rhymes with:
alienated, alternated, assassinated, carbonated, chlorinated, concatenated, contaminated, culminated, detonated, discriminated, disseminated, dominated, donated, eliminated, fascinated, illuminated, impregnated, laminated, nominated, originated, oxygenated, procrastinated, terminated, uncontaminated
Caffeinated sounds like:
cabinda, cabinet, caffeinate, casavant, cheapened, checkpoint, copayment, couponite, covenant, covent