Lexicography :: Lexicography (n.) The art, process, or occupation of making a lexicon or dictionary; the principles which are applied in making dictionaries..
Lexicology :: Lexicology (n.) The science of the derivation and signification of words; that branch of learning which treats of the signification and application of words.
Lexicon :: Lexicon (n.) A vocabulary, or book containing an alphabetical arrangement of the words in a language or of a considerable number of them, with the definition of each; a dictionary; especially, a dictionary of the Greek, Hebrew, or Latin language..