psychological warfare vs war of nerves

psychological warfare and war of nerves both are nouns.

Word	Noun	Adjective	Verb	Adverb
psychological warfare	Yes	No	No	No
war of nerves	Yes	No	No	No

As nouns, psychological warfare and war of nerves are synonyms defined as:

psychological warfare and war of nerves: the use of psychological tactics to destroy the opponents' morale

psychological warfare (noun)	war of nerves (noun)
the use of psychological tactics to destroy the opponents' morale	the use of psychological tactics to destroy the opponents' morale