This document defines key terms and concepts related to grammar. It begins by defining grammar as the system of rules that govern how thoughts are expressed in a language. It then defines several important terminology including alphabet, letter, word, and phrase. It discusses the eight parts of speech in English - noun, pronoun, adjective, adverb, verb, preposition, conjunction, and interjection. For nouns specifically, it covers roots, case, gender, number, and kinds of nouns including proper, common, material nouns and more. It also discusses pronouns, adjectives and their various types.