lexicon
Definition
The vocabulary of a person, language, or subject; a dictionary or compendium of terms.
हिन्दी किसी व्यक्ति, भाषा या विषय का शब्दावली; शब्दों का शब्दकोश या संग्रह।
Example
"Medical professionals often use a specialized lexicon that can be difficult for patients to understand."