syntony vs mental condition

syntony and mental condition both are nouns.

Word	Noun	Adjective	Verb	Adverb
syntony	Yes	No	No	No
mental condition	Yes	No	No	No

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

syntony: the state of being normally responsive to and in harmony with the environment.
mental condition: (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 syntony include mental state, psychological condition, psychological state.

syntony (noun)	mental condition (noun)
the state of being normally responsive to and in harmony with the environment.	(psychology) a mental condition in which the qualities of a state are relatively constant even though the state itself may be dynamic