Dissemination rhymes with:
insemination, emanation, insemination, abomination, antidiscrimination, contamination, culmination, decontamination, denomination, determination, discrimination, domination, elimination, emanation, examination, extermination, germination, illumination, incrimination, insemination, nomination, reexamination, renomination, self-determination, termination, transillumination
Dissemination sounds like:
decimation, designation, discontinue, documentation