Impregnated rhymes with:
alienated, alternated, assassinated, caffeinated, carbonated, chlorinated, concatenated, contaminated, culminated, detonated, discriminated, disseminated, dominated, donated, eliminated, fascinated, illuminated, laminated, nominated, originated, oxygenated, procrastinated, terminated, uncontaminated
Impregnated sounds like:
impersonate, impersonated, impoverishment, impregnate, impressment, imprisoned, imprisonment, infrequent