anhedonia vs mental state

anhedonia and mental state both are nouns.

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

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

anhedonia: an inability to experience pleasure
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 anhedonia include mental condition, psychological condition, psychological state.

anhedonia (noun)	mental state (noun)
an inability to experience pleasure	(psychology) a mental condition in which the qualities of a state are relatively constant even though the state itself may be dynamic