malacia vs pathology

malacia and pathology both are nouns.

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

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

malacia (noun)	pathology (noun)
a state of abnormal softening of tissue	the branch of medical science that studies the causes and nature and effects of diseases
	any deviation from a healthy or normal condition