myopathy vs pathology

myopathy and pathology both are nouns.

Word	Noun	Adjective	Verb	Adverb
myopathy	Yes	No	No	No
pathology	Yes	No	No	No

As nouns, pathology is a hypernym of myopathy; that is, pathology is a word with a broader meaning than myopathy:

myopathy: any pathology of the muscles that is not attributable to nerve dysfunction
pathology: any deviation from a healthy or normal condition

myopathy (noun)	pathology (noun)
any pathology of the muscles that is not attributable to nerve dysfunction	the branch of medical science that studies the causes and nature and effects of diseases
	any deviation from a healthy or normal condition