contortion vs change of shape

contortion and change of shape both are nouns.

Word	Noun	Adjective	Verb	Adverb
contortion	Yes	No	No	No
change of shape	Yes	No	No	No

As nouns, change of shape is a hypernym of contortion; that is, change of shape is a word with a broader meaning than contortion:

contortion: the act of twisting or deforming the shape of something (e.g., yourself)
change of shape: an action that changes the shape of something

contortion (noun)	change of shape (noun)
the act of twisting or deforming the shape of something (e.g., yourself)	an action that changes the shape of something
a tortuous and twisted shape or position