This document summarizes key concepts in word study from a presentation on the topic. It defines a word as the smallest linguistic unit that can be uttered with meaning. Words are made up of phonemes when spoken and graphemes like letters when written. Word study involves examining words from phonetic, graphic, grammatical, and lexical perspectives. A word is identified by its sound and written form, while a lexeme refers to an identifiable semantic unit. Meaning depends on relationships between words and their referents in the world. The document also discusses lexical categories, meaning and information transmission, componential analysis of word definitions, and selectional restrictions on compatible words in sentences.