A lexicographer writes about words, and the word "lexicography" comes from Greek terms that mean "to write" and "word." The Greek "lexis" (which could mean either "word" or "speech") is an ancestor of several English words related to speech and writing, including "lexicon" (another name for the vocabulary of a language or for the dictionary itself) and "dyslexia" (a condition that can make it difficult to read). "Graphein," a Greek verb meaning "to write," also has many English offspring. You've seen its kin in English words that end in "-graphy" or "-graph," such as "geography" and "paragraph."