As nouns the difference between aha and aaa

is that aha is initialism of lang=en while aaa is initialism of lang=en.

As proper nouns the difference between aha and aaa

is that aha is initialism of American Heart Association|lang=en while Aaa is alaska.

As an interjection aha

is an exclamation of understanding, realization, invention, or recognition.

As a symbol 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 an initialism AAA is

Abdominal aortic aneurysm