This document defines and provides examples of different types of compound words. It discusses endocentric compounds which have a head word that determines the category of the compound, and exocentric compounds which have no head word. Within exocentric compounds, it distinguishes bahuvrihi compounds which refer to attributes rather than entities, and copulative compounds which have a dual or plural relationship between constituents. The document also compares compounds to phrases and derived words, and discusses issues with distinguishing between them. Finally, it introduces the concepts of synthetic compounds, interfixes, allomorphy, and noun incorporation in word formation.