What is the difference between dementia and Alzheimer's disease?

My brother had dementia? Alzheimers? As I understand you don't die from Alzheimers per se....you die from complications resulting from Alzheimers. So when my brother forgot how to swallow, he aspirated food/drink into lungs which resulted in pneumonia. I refused to have him have a feeding tube, as the last 2 years he no longer recognized me, so I realized I needed to say goodbye. I should have had him tested for APOE.....I don't know if I have gene

Interesting question. I have wondered also. What is this forgetfulness caused from? I tried to Google this question and received:

Dementia is a broader term referring to a decline in cognitive abilities, while Alzheimer's disease is a specific type of dementia. Alzheimer's disease is the most common cause of dementia. Essentially, Alzheimer's is a disease that causes dementia.
Here's a more detailed breakdown:
Dementia:
This is an umbrella term for a group of symptoms, including memory loss, impaired thinking, and behavioral changes, that interfere with daily life.
Alzheimer's Disease:
This is a specific disease that causes dementia. It's characterized by the progressive destruction of brain cells, leading to cognitive decline.
Other Types of Dementia:
While Alzheimer's is the most common, other types of dementia include vascular dementia, Lewy body dementia, and frontotemporal dementia.
Progression:
Alzheimer's disease is a progressive condition, meaning that symptoms worsen over time.
Causes:
Alzheimer's disease is caused by the build-up of proteins (amyloid plaques and neurofibrillary tangles) in the brain, which disrupts brain cell function.
Symptoms:
Common early symptoms of Alzheimer's include memory loss, particularly for recent events, and difficulty with language and abstract thinking.
No Cure:
Currently, there is no cure for either dementia or Alzheimer's disease, but treatments can help manage symptoms and improve quality of life.

I've purchases Dr. Bredesen's book from Amazon, and will start reading. Thanks again for the suggestion!!! And God Bless!!!

Well said
Frontotemporal degeneration is umbrella term as well. It includes PPA, Alzheimer’s , PSP, CBS etc.
Some people don’t experience dementia until the disease progresses if they live that long