ADP vs IDP

ADP and IDP both are nouns.

Word	Noun	Adjective	Verb	Adverb
ADP	Yes	No	No	No
IDP	Yes	No	No	No

As nouns, IDP is a hyponym of ADP; that is, IDP is a word with a more specific, narrower meaning than ADP:

ADP: data processing by a computer
IDP: automatic data processing in which data acquisition and other stages or processing are integrated into a coherent system

Other hyponyms of ADP include EDP, electronic data processing, integrated data processing.

ADP (noun)	IDP (noun)
data processing by a computer	automatic data processing in which data acquisition and other stages or processing are integrated into a coherent system
an ester of adenosine that is converted to ATP for energy storage