disassociation vs mental state

disassociation and mental state both are nouns.

Word	Noun	Adjective	Verb	Adverb
disassociation	Yes	No	No	No
mental state	Yes	No	No	No

As nouns, mental state is a hypernym of disassociation; that is, mental state is a word with a broader meaning than disassociation:

disassociation: a state in which some integrated part of a person's life becomes separated from the rest of the personality and functions independently
mental state: (psychology) a mental condition in which the qualities of a state are relatively constant even though the state itself may be dynamic

Other hypernyms of disassociation include mental condition, psychological condition, psychological state.

disassociation (noun)	mental state (noun)
a state in which some integrated part of a person's life becomes separated from the rest of the personality and functions independently	(psychology) a mental condition in which the qualities of a state are relatively constant even though the state itself may be dynamic
the state of being unconnected in memory or imagination