World Trade Center vs WTC

World Trade Center and WTC both are nouns.

Word	Noun	Adjective	Verb	Adverb
World Trade Center	Yes	No	No	No
WTC	Yes	No	No	No

As nouns, World Trade Center and WTC are synonyms defined as:

World Trade Center and WTC: twin skyscrapers 110 stories high in New York City; built 1368 feet tall in 1970 to 1973; destroyed by a terrorist attack on September 11, 2001

Other synonyms of World Trade Center include twin towers.

World Trade Center (noun)	WTC (noun)
twin skyscrapers 110 stories high in New York City; built 1368 feet tall in 1970 to 1973; destroyed by a terrorist attack on September 11, 2001	twin skyscrapers 110 stories high in New York City; built 1368 feet tall in 1970 to 1973; destroyed by a terrorist attack on September 11, 2001