nerves vs mental condition

nerves and mental condition both are nouns.

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

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

nerves: an uneasy psychological state
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 nerves include mental state, psychological condition, psychological state.

nerves (noun)	mental condition (noun)
control of your emotions	(psychology) a mental condition in which the qualities of a state are relatively constant even though the state itself may be dynamic
an uneasy psychological state