Panic attack and Panic disorder

Panic attack noun - A sudden attack of fear.

Panic disorder and panic attack are semantically related. in anxiety attack topic. In some cases you can use "Panic disorder" instead a noun phrase "Panic attack".

Panic disorder noun - An anxiety disorder characterized by unpredictable panic attacks; the attacks are usually severe but brief.

Panic attack and panic disorder are semantically related. Sometimes you can replace phrase "Panic attack" with "Panic disorder", this phrases are similar.