The reference work that gives text-specific definitions for a small number of words is a glossary.
The reference work that provides text-specific definitions for a small number of words is called a glossary. A glossary typically appears at the end of a book, article, or document and provides explanations or definitions of key terms or specialized vocabulary used within that text. It serves as a helpful tool for readers to quickly find the meanings of specific words or terms without having to search through an entire dictionary or encyclopedia. So, the correct answer in this case is glossary.
