attention deficit hyperactivity disorder vs ADD

attention deficit hyperactivity disorder and ADD both are nouns.

Word	Noun	Adjective	Verb	Adverb
attention deficit hyperactivity disorder	Yes	No	No	No
ADD	Yes	No	No	No

As nouns, attention deficit hyperactivity disorder and ADD are synonyms defined as:

attention deficit hyperactivity disorder and ADD: a condition (mostly in boys) characterized by behavioral and learning disorders

Other synonyms of attention deficit hyperactivity disorder include ADHD, attention deficit disorder, hyperkinetic syndrome, MBD, minimal brain damage, minimal brain dysfunction.

attention deficit hyperactivity disorder (noun)	ADD (noun)
a condition (mostly in boys) characterized by behavioral and learning disorders	a condition (mostly in boys) characterized by behavioral and learning disorders