war of nerves vs psychological warfare

war of nerves and psychological warfare both are nouns.

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

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

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

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