administrative unit vs administrative body

administrative unit and administrative body both are nouns.

Word	Noun	Adjective	Verb	Adverb
administrative unit	Yes	No	No	No
administrative body	Yes	No	No	No

As nouns, administrative unit and administrative body are synonyms defined as:

administrative unit and administrative body: a unit with administrative responsibilities

administrative unit (noun)	administrative body (noun)
a unit with administrative responsibilities	a unit with administrative responsibilities