hallucinosis vs mental state

hallucinosis and mental state both are nouns.

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

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

hallucinosis: a mental state in which the person has continual hallucinations
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 hallucinosis include mental condition, psychological condition, psychological state.

hallucinosis (noun)	mental state (noun)
a mental state in which the person has continual hallucinations	(psychology) a mental condition in which the qualities of a state are relatively constant even though the state itself may be dynamic