Park Ave. vs Park Avenue

Park Ave. and Park Avenue both are nouns.

Word	Noun	Adjective	Verb	Adverb
Park Ave.	Yes	No	No	No
Park Avenue	Yes	No	No	No

As nouns, Park Ave. and Park Avenue are synonyms defined as:

Park Ave. and Park Avenue: a fashionable residential street in New York City

Park Ave. (noun)	Park Avenue (noun)
a fashionable residential street in New York City	a fashionable residential street in New York City