What are the differences in symptoms for alzheimer's and dementia?

Memory loss: Consider Alzheimer's disease as largest slice of dementia pie. In other words, Alzheimer's disease is a type of dementia such that both have memory loss in common. Other types of dementia like vascular dementia & Lewy body also share memory loss in common. What differs is how said memory loss presents itself, whether gradual or step-wise, w/ or w/o movement disorder. Check out http://alz.org

AD is a dementia: Dementia describes a collection of brain symptoms including memory impairment, problems using or understanding words, loss of functioning and judgement and other symptoms. Alzheimers disease is the most common type of dementia. In Alzheimers problems forming new memories, trouble with word finding, getting lost and difficulty with problem solving are common.