terminology vs toponymy

terminology and toponymy both are nouns.

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

As nouns, toponymy is a hyponym of terminology; that is, toponymy is a word with a more specific, narrower meaning than terminology:

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

Other hyponyms of terminology include markup language, toponomy.

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