Nomenclature (11)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
terminology
'nomenclature' is the definition.
(I know that nomenclature can be written as terminology)
This is all the clue.
(Other definitions for terminology that I've seen before include "Phraseology" , "Nomenclature" , "Special words" , "Jargon" .)