nonfunctional vs defective

nonfunctional and defective both are adjectives.

Word	Noun	Adjective	Verb	Adverb
nonfunctional	No	Yes	No	No
defective	No	Yes	No	No

nonfunctional (adjective)	defective (adjective)
not having or performing a function	markedly subnormal in structure or function or intelligence or behavior
not performing or able to perform its regular function	having a defect
	not working properly