How is stuttering different from apraxia of speech?

Apraxia of speech (AOS) is a sequencing disorder making it difficult for individuals to say a string of sounds. While a speaker with AOS  may have no problem saying a word like “paw”, there would be difficulty in saying “popular” due to the several syllables it contains. Individuals who have apraxia of speech know what they want to say, but the tongue movements to create the appropriate sounds become difficult to coordinate. Those who stutter have a similar difficulty of not being able to get out the sounds they want to say, but the trouble is less about coordination and sequencing, and more about tension and airflow. For individuals with AOS, longer words and sentences are more difficult than shorter ones; for those who stutter, the length of the word or phrase is mostly irrelevant-- is it more so the sounds, and particularly the initial ones.