https://www.understood.org/en/learning-attention-issues/child-learning-disabilities/executive-functioning-issues/difference-between-executive-functioning-issues-and-adhd

In many ways, ADHD and executive functioning issues go hand in hand. That’s because most of the symptoms of ADHD (also known as ADD) are actually problems with executive function. (You’ll see the signs of each are very similar!) There’s one big difference between the two, however.