nomenclature vs terminology

nomenclature and terminology both are nouns.

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

As nouns, nomenclature and terminology are synonyms defined as:

nomenclature and terminology: a system of words used to name things in a particular discipline

Other synonyms of nomenclature include language.

nomenclature (noun)	terminology (noun)
a system of words used to name things in a particular discipline	a system of words used to name things in a particular discipline