This document discusses different types of sense relations, including oppositeness, antonymy, contradictoriness, and ambiguity. It defines four basic types of antonymy: binary antonyms, converses, multiple incompatibles (systems), and gradable antonymy. It also distinguishes between homonymy and polysemy as two types of ambiguous words. Finally, it discusses lexical ambiguity from ambiguous words and structural (or grammatical) ambiguity in sentences without ambiguous words.