WTC vs World Trade Center

WTC and World Trade Center both are nouns.

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

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

WTC and World Trade Center: 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 WTC include twin towers.

WTC (noun)	World Trade Center (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