suburb vs addition

suburb and addition both are nouns.

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

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

suburb: a residential district located on the outskirts of a city
addition: a suburban area laid out in streets and lots for a future residential area

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

suburb (noun)	addition (noun)
a residential district located on the outskirts of a city	the arithmetic operation of summing; calculating the sum of two or more numbers
	the act of adding one thing to another
	a component that is added to something to improve it
	a suburban area laid out in streets and lots for a future residential area
	something added to what you already have
	a quantity that is added