"What's the difference between dementia and Alzheimer's?" It's a question I hear in almost every workshop I facilitate for the Alzheimer's Association. In short: dementia is a general or "umbrella" term identifying a group of symptoms; it is not a specific diagnosis. The most common diagnoses for dementia are: Alzheimer's, Lewy Body, Frontotemporal and Vascular.
I created an image to illustrate the "umbrella" term of dementia and some common specific dementia diagnoses. Feel free to use in your efforts: please include credit.