Context Clues include the following 3 things…(Lesson 6.2)

Which reference material would you use to find synonyms or antonyms?
Which reference material would you use to learn the word’s meaning, pronunciation, or origin?
What reference material would you use that is located in the back of a book to learn the meaning of technical vocabulary?

To find synonyms or antonyms, the reference material you would use is a thesaurus.

To learn a word's meaning, pronunciation, or origin, the reference material you would use is a dictionary.
The reference material located in the back of a book to learn the meaning of technical vocabulary is a glossary or an index.