wasting away vs atrophy

wasting away and atrophy both are nouns.

Word	Noun	Adjective	Verb	Adverb
wasting away	Yes	No	No	No
atrophy	Yes	No	Yes	No

As nouns, wasting away and atrophy are synonyms defined as:

wasting away and atrophy: a decrease in size of an organ caused by disease or disuse

Other synonyms of wasting away include wasting.

wasting away (noun)	atrophy (noun)
a decrease in size of an organ caused by disease or disuse	any weakening or degeneration (especially through lack of use)
	a decrease in size of an organ caused by disease or disuse

wasting away (verb)	atrophy (verb)
	undergo atrophy