agoraphobia vs phobic neurosis

agoraphobia and phobic neurosis both are nouns.

Word	Noun	Adjective	Verb	Adverb
agoraphobia	Yes	No	No	No
phobic neurosis	Yes	No	No	No

As nouns, phobic neurosis is a hypernym of agoraphobia; that is, phobic neurosis is a word with a broader meaning than agoraphobia:

agoraphobia: a morbid fear of open spaces (as fear of being caught alone in some public place)
phobic neurosis: an anxiety disorder characterized by extreme and irrational fear of simple things or social situations

Other hypernyms of agoraphobia include phobia, phobic disorder.

agoraphobia (noun)	phobic neurosis (noun)
a morbid fear of open spaces (as fear of being caught alone in some public place)	an anxiety disorder characterized by extreme and irrational fear of simple things or social situations