suburb vs faubourg

suburb and faubourg both are nouns.

Word	Noun	Adjective	Verb	Adverb
suburb	Yes	No	No	No
faubourg	Yes	No	No	No

As nouns, faubourg is a hyponym of suburb; that is, faubourg is a word with a more specific, narrower meaning than suburb:

suburb: a residential district located on the outskirts of a city
faubourg: a New Orleans district lying outside the original city limits; used in combination with the names of various quarters of the city

Other hyponyms of suburb include addition, bedroom community, stockbroker belt.

suburb (noun)	faubourg (noun)
a residential district located on the outskirts of a city	a New Orleans district lying outside the original city limits; used in combination with the names of various quarters of the city