flatten out vs deform

flatten out and deform both are verbs.

Word	Noun	Adjective	Verb	Adverb
flatten out	No	No	Yes	No
deform	No	No	Yes	No

As verbs, deform is a hypernym of flatten out; that is, deform is a word with a broader meaning than flatten out:

Other hypernyms of flatten out include change form, change shape.

flatten out (verb)	deform (verb)
become flat or flatter	become misshapen
	alter the shape of (something) by stress
	assume a different shape or form
	make formless
	cause (an object) to assume a crooked or angular form
	twist and press out of shape