Dwi Astuti,Morphological and Morphophonemic Process 175 MORPHOLOGICAL AND MORPHOPHONEMIC PROCESS (NATURE, TYPES, AND RULES) Dwi Astuti Wahyu Nurhayati STAIN Tulungagung, East Java Abstract: Morphology or morphemic is defined as the study of the morpheme and their arrangements in building new larger morphological constructions. Morph is a physical form representing some morpheme in a language. Morpheme is the minimal unit of linguistics in a certain language. Seeing from the word formation, a new word in English and the change form of morpheme can be analyzed through two main processes. The morphological process has two main types of processes, affixation and non affixation. Affixation consists of two processes, (1) internal change, (2) Zero Modification. Affixation has ten processes namely (1)compounding, (2) blending, (3) borrowing, (4) coinage, (5) clipping, (6) backformation, (7) conversion (8) acronym, (9) multiple process (10)Reduplication. Morphophonemic processes are classified into ten processes, namely (1) loss of phonemes, (2) addition of phonemes, (3) simple consonant change, (4) assimilation; (5) dissimilation; (6) synthesis; (7) change of syllabic vowel or diphthong; (8) gradation; and (10) suppletion. This article tries to describe the process which should be conducted to analyze the word formation through morphological and morphophonemic processes. Key words: process, morphological, morphophonemic As a matter of fact, the term word is difficult to define, and not many linguists try to define it especially after more and more primitive and alien language has been analyzed. Most people usually understand what a word in those two languages, and that’s why it is taken for granted. They always agree that a word is a linguistic from larger than one morpheme. Then it is better for the learners to study it deeper. Like syllables and sentences, words have an internal structure consisting of smaller units organized with respect to each other in a particular way. The most important component of word structure is the morpheme, the smallest unit of language that carries information about meaning or function. In other word morpheme is defined as the smallest unit of meaning or grammatical function (Katamba, 1993: 42). The word builder, for example, consists of two morphemes: build (with the meaning of (‘construct’) and –er (which indicates that the entire word functions as a noun with the meaning ‘one who builds’).Similarly, the word house is made up of the morphemes house (with the meaning of ‘dwelling’) and –s (with the meaning’ more than one’). Some words consist of a single morpheme. For example, the word train cannot be divided into smaller parts (say, tr and ain) that carry information