language zone vs language area

language zone and language area both are nouns.

Word	Noun	Adjective	Verb	Adverb
language zone	Yes	No	No	No
language area	Yes	No	No	No

As nouns, language zone and language area are synonyms defined as:

language zone and language area: a large cortical area (in the left hemisphere in most people) containing all the centers associated with language

language zone (noun)	language area (noun)
a large cortical area (in the left hemisphere in most people) containing all the centers associated with language	a large cortical area (in the left hemisphere in most people) containing all the centers associated with language