As symbols the difference between aad and aaa

is that aad is A designation on prerecorded compact discs indicating that the contents were recorded and mixed in analog before being mastered to a digital medium; compare ADD, DAD, DDD.AAA is the highest level of minor league baseball, often used by extension in other sports to indicate the highest level of minor league play in that sport as well.

As proper nouns the difference between aad and aaa

is that aad is initialism of American Academy of DentistsAaa is alaska.

As nouns the difference between aad and aaa

is that aad is initialism of Aircraft Assignment Directive while aaa is initialism of lang=en.

As an adjective aad

is old.

As an initialism AAA is

Abdominal aortic aneurysm