suburban area vs suburbia

suburban area and suburbia both are nouns.

Word	Noun	Adjective	Verb	Adverb
suburban area	Yes	No	No	No
suburbia	Yes	No	No	No

As nouns, suburban area and suburbia are synonyms defined as:

suburban area and suburbia: a residential district located on the outskirts of a city

Other synonyms of suburban area include suburb.

suburban area (noun)	suburbia (noun)
a residential district located on the outskirts of a city	suburbanites considered as a cultural class or subculture
	a residential district located on the outskirts of a city