malformation vs deformity

malformation and deformity both are nouns.

Word	Noun	Adjective	Verb	Adverb
malformation	Yes	No	No	No
deformity	Yes	No	No	No

As nouns, malformation and deformity are synonyms defined as:

malformation and deformity: an affliction in which some part of the body is misshapen or malformed

Other synonyms of malformation include misshapenness.

malformation (noun)	deformity (noun)
something abnormal or anomalous	an appearance that has been spoiled or is misshapen
an affliction in which some part of the body is misshapen or malformed	an affliction in which some part of the body is misshapen or malformed