Wall St. vs Wall Street

Wall St. and Wall Street both are nouns.

Word	Noun	Adjective	Verb	Adverb
Wall St.	Yes	No	No	No
Wall Street	Yes	No	No	No

As nouns, Wall St. and Wall Street are synonyms defined as:

Wall St. and Wall Street: a street in lower Manhattan where the New York Stock Exchange is located; symbol of American finance

Wall St. (noun)	Wall Street (noun)
a street in lower Manhattan where the New York Stock Exchange is located; symbol of American finance	used to allude to the securities industry of the United States
	a street in lower Manhattan where the New York Stock Exchange is located; symbol of American finance