neuroticism vs psychoneurosis

neuroticism and psychoneurosis both are nouns.

Word	Noun	Adjective	Verb	Adverb
neuroticism	Yes	No	No	No
psychoneurosis	Yes	No	No	No

As nouns, neuroticism and psychoneurosis are synonyms defined as:

neuroticism and psychoneurosis: a mental or personality disturbance not attributable to any known neurological or organic dysfunction

Other synonyms of neuroticism include neurosis.

neuroticism (noun)	psychoneurosis (noun)
a mental or personality disturbance not attributable to any known neurological or organic dysfunction	a mental or personality disturbance not attributable to any known neurological or organic dysfunction