mental unsoundness vs derangement

mental unsoundness and derangement both are nouns.

Word	Noun	Adjective	Verb	Adverb
mental unsoundness	Yes	No	No	No
derangement	Yes	No	No	No

As nouns, mental unsoundness and derangement are synonyms defined as:

mental unsoundness and derangement: a state of mental disturbance and disorientation

Other synonyms of mental unsoundness include unbalance.

mental unsoundness (noun)	derangement (noun)
a state of mental disturbance and disorientation	the act of disturbing the mind or body
	a state of mental disturbance and disorientation