This document discusses several key linguistic concepts: 1. Semantic features examine the meaning and properties of words, such as whether something is animate or canine. 2. Synonyms share a degree of similarity in meaning but can be distinguished from each other. 3. Antonyms are binary opposition pairs where one term is the opposite of the other, such as tall/short or young/old. 4. Polysemy refers to a single word that has multiple related meanings.