NTIS vs government agency

NTIS and government agency both are nouns.

Word	Noun	Adjective	Verb	Adverb
NTIS	Yes	No	No	No
government agency	Yes	No	No	No

As nouns, government agency is a hypernym of NTIS; that is, government agency is a word with a broader meaning than NTIS:

NTIS: an agency in the Technology Administration that is a primary resource for government-funded scientific and technical and engineering and business related information
government agency: an administrative unit of government

Other hypernyms of NTIS include agency, authority, bureau, federal agency, office.

NTIS (noun)	government agency (noun)
an agency in the Technology Administration that is a primary resource for government-funded scientific and technical and engineering and business related information	an administrative unit of government