This document outlines different types of meaningful relations between words: synonymy, antonymy, and hyponymy. It defines synonymy as words with the same meaning, though notes there are no perfect synonyms due to differences in emotion, dialect, style, and collocation. Antonyms are divided into four categories: gradable, complementary, converses, and directional opposites. Hyponymy describes a hierarchical relationship where a word is a subtype of a more general superordinate word.