deformation vs deformational

deformation is a noun but deformational is not a noun.

Word	Noun	Adjective	Verb	Adverb
deformation	Yes	No	No	No
deformational	No	Yes	No	No

deformation (noun)	deformational (noun)
the act of twisting or deforming the shape of something (e.g., yourself)
a change for the worse
alteration in the shape or dimensions of an object as a result of the application of stress to it

deformation (adjective)	deformational (adjective)
	relating to or causing change in either shape or size of a material body or geometric figure