Van Wyk classifies words into different parts of speech such as nouns, pronouns, verbs, adverbs, interjections, and others. Nouns can take prefixes and suffixes to change their meaning. Pronouns are classified based on their construction. Van Wyk also discusses how words can function in different ways within sentences such as being movable, replaceable, and able to stand alone. Words are building blocks that convey meaning based on their sounds, spelling, and arrangement. Van Wyk's framework provides a way to systematically analyze and understand how words work in language.