parking space vs parking zone

parking space and parking zone both are nouns.

Word	Noun	Adjective	Verb	Adverb
parking space	Yes	No	No	No
parking zone	Yes	No	No	No

As nouns, parking space and parking zone are synonyms defined as:

parking space and parking zone: a space where an automobile can be parked

parking space (noun)	parking zone (noun)
a space where an automobile can be parked	a space where an automobile can be parked