demineralisation vs pathology

demineralisation and pathology both are nouns.

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

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

demineralisation (noun)	pathology (noun)
the removal of minerals and mineral salts from a liquid (especially from water)	the branch of medical science that studies the causes and nature and effects of diseases
abnormal loss of mineral salts (especially from bone)	any deviation from a healthy or normal condition