As verbs the difference between squirm and scream
is that
squirm is to twist one’s body with snakelike motions while
scream is to cry out with a shrill voice; to utter a sudden, sharp outcry, or shrill, loud cry, as in fright or extreme pain; to shriek; to screech.
As nouns the difference between squirm and scream
is that
squirm is a twisting, snakelike movement of the body while
scream is a loud, emphatic, exclamation of extreme emotion, usually horror, fear, excitement et cetera can be the exclamation of a word, but is usually a sustained, high-pitched vowel sound, particularly /æ/ or /i/.