This document discusses word-level morphology, including parts of speech and their identification. It covers: 1. Classification of words into open classes (nouns, verbs, adjectives, adverbs) and closed classes (determiners, auxiliaries, etc). 2. Methods for identifying parts of speech using test frames that isolate the variable element. 3. Inflectional and derivational affixes used to form different parts of speech, such as plural nouns, comparative adjectives, adverbs from adjectives. 4. Formulas representing morphological structures of words, including inflectional and derivational constructions.