posology vs pharmacology

posology and pharmacology both are nouns.

Word	Noun	Adjective	Verb	Adverb
posology	Yes	No	No	No
pharmacology	Yes	No	No	No

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

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

Other hypernyms of posology include materia medica, pharmacological medicine.

posology (noun)	pharmacology (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