Dementia and Senile psychosis

Dementia noun - A serious mental disorder that prevents one from living a safe and normal life.

Senile psychosis and dementia are semantically related. In some cases you can replace phrase "Senile psychosis" with "Dementia", this terms are similar.

Senile psychosis noun - Dementia of the aged; results from degeneration of the brain in the absence of cerebrovascular disease.

Dementia and senile psychosis are semantically related. You can use "Dementia" instead a noun phrase "Senile psychosis".