posology vs materia medica

posology and materia medica both are nouns.

Word	Noun	Adjective	Verb	Adverb
posology	Yes	No	No	No
materia medica	Yes	No	No	No

As nouns, materia medica is a hypernym of posology; that is, materia medica is a word with a broader meaning than posology:

posology: the pharmacological determination of appropriate doses of drugs and medicines
materia medica: the science or study of drugs: their preparation and properties and uses and effects

Other hypernyms of posology include pharmacological medicine, pharmacology.

posology (noun)	materia medica (noun)
the pharmacological determination of appropriate doses of drugs and medicines	the science or study of drugs: their preparation and properties and uses and effects