morphology Morphology is the branch of grammar that studies the internal structure of words and the rules of word formation Morphology falls into two categories: inflectional morphology(study of inflections)and lexical/derivational morphology(study of word formation)Morphology • Morphology is the branch of grammar that studies the internal structure of words and the rules of word formation. • Morphology falls into two categories: inflectional morphology (study of inflections) and lexical/derivational morphology (study of word formation)