６．Should I know any other words that relate to this one?
Cross-references help you learn more vocabulary connected with a word. They often refer to words with a similar or contrasting meaning.
Some cross-references direct you to other words belonging to a particular group of related things.
A coloured word at the end of a definition shows a more common synonym ( word that has the same meaning ) for the word you have looked up.
In a definition, we explain the meaning of an important related word that is not in the Defining Vocabulary, when you need it to understand the meaning.
A note tells you when the opposite of a word is formed with in- rather than un-.