monoideism vs mental state

monoideism and mental state both are nouns.

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

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

monoideism: a state of prolonged absorption in a single idea (as in mental depression, trance, hypnosis).
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 monoideism include mental condition, psychological condition, psychological state.

monoideism (noun)	mental state (noun)
a state of prolonged absorption in a single idea (as in mental depression, trance, hypnosis).	(psychology) a mental condition in which the qualities of a state are relatively constant even though the state itself may be dynamic