Alzheimer's and Senility

Alzheimer's noun - A progressive form of presenile dementia that is similar to senile dementia except that it usually starts in the 40s or 50s; first symptoms are impaired memory which is followed by impaired thought and speech and finally complete helplessness.

Senility and Alzheimer's are semantically related In some cases you can replace term "Senility" with "Alzheimer's", this nouns are similar.

Senility noun - The state or period of mental decline that typically accompanies old age.

Alzheimer's and senility are semantically related in decrepitude topic. You can use "Alzheimer's" instead a noun "Senility".