toponomy vs terminology

toponomy and terminology both are nouns.

Word	Noun	Adjective	Verb	Adverb
toponomy	Yes	No	No	No
terminology	Yes	No	No	No

As nouns, terminology is a hypernym of toponomy; that is, terminology is a word with a broader meaning than toponomy:

toponomy: the nomenclature of regional anatomy
terminology: a system of words used to name things in a particular discipline

Other hypernyms of toponomy include language, nomenclature.

toponomy (noun)	terminology (noun)
the branch of lexicology that studies the place names of a region or a language	a system of words used to name things in a particular discipline
the nomenclature of regional anatomy