This document discusses understanding words and word formation. It explains that synonyms have the same meaning but are different words, while antonyms have different meanings. It also discusses prefixes like "im", "meta", and "inter" and suffixes like "-ion", "-ise", and "-fy" as ways to form new words and change meanings. The document is about vocabulary building and was created by Jowati Juhary, PhD for an LEL 1002 Vocabulary course.