The personal dictionary project is about the way of understanding given words without a dictionary.
What we normally understand a certain vocabulary without looking up the meaning, we use:
• The context
• Synonyms and antonyms
• Affixes and prefixes
The three different level of gray colour tone refers three different ways.
For instance, when we use synonyms, we do not need other supporting words in the text. So the synonym word stands out.
When we need context to understand, then we would look every word in the text, so whole text stands out.