Decontaminated rhymes with:
denominated, emanated, exterminated, germinated, predominated, renominated, decaffeinated, denominated, emanated, exterminated, germinated, halogenated, hydrogenated, hyphenated, impersonated, indoctrinated, marinated, opinionated, predominated, rejuvenated, renominated, resonated, subordinated
Decontaminated sounds like:
decontaminate, descendant, descendent, discontent, discontented, discontinued, discontinuity