DOE vs executive department

DOE and executive department both are nouns.

Word	Noun	Adjective	Verb	Adverb
DOE	Yes	No	No	No
executive department	Yes	No	No	No

As nouns, executive department is a hypernym of DOE; that is, executive department is a word with a broader meaning than DOE:

DOE: the federal department responsible for maintaining a national energy policy of the United States; created in 1977
executive department: a federal department in the executive branch of the government of the United States

DOE (noun)	executive department (noun)
the federal department responsible for maintaining a national energy policy of the United States; created in 1977	a federal department in the executive branch of the government of the United States