Presenile dementia and Pick's disease

Presenile dementia noun - Dementia with onset before the age of 65.

Pick's disease and presenile dementia are semantically related. In some cases you can replace phrase "Pick's disease" with "Presenile dementia", this phrases are similar.

Pick's disease noun - A progressive form of presenile dementia found most often in middle-aged and elderly women and characterized by degeneration of the frontal and temporal lobes with loss of intellectual ability and transitory aphasia.

Presenile dementia and Pick's disease are semantically related. You can use "Presenile dementia" instead a noun phrase "Pick's disease".