atrophy vs amyotrophia

atrophy and amyotrophia both are nouns.

Word	Noun	Adjective	Verb	Adverb
atrophy	Yes	No	Yes	No
amyotrophia	Yes	No	No	No

As nouns, amyotrophia is a hyponym of atrophy; that is, amyotrophia is a word with a more specific, narrower meaning than atrophy:

Other hyponyms of atrophy include amyotrophy, tabes, kraurosis.

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

atrophy (verb)	amyotrophia (verb)
undergo atrophy