NCDC vs National Climatic Data Center

NCDC and National Climatic Data Center both are nouns.

Word	Noun	Adjective	Verb	Adverb
NCDC	Yes	No	No	No
National Climatic Data Center	Yes	No	No	No

As nouns, NCDC and National Climatic Data Center are synonyms defined as:

NCDC and National Climatic Data Center: the part of NOAA that maintains the world's largest active archive of weather data

NCDC (noun)	National Climatic Data Center (noun)
the part of NOAA that maintains the world's largest active archive of weather data	the part of NOAA that maintains the world's largest active archive of weather data