This study is an attempt made to describe Oromo NOUNS andrnADJECTIVES. The purpose of the study is to see if NOUNS and ADJEe-rnTIVES in Oromo can be treated as constituents of just one classrninstead of the traditional two. To this end, the formal and distributionalrncharacteristics of NOUNS and ADJECTIVES have been examinedrnin s i x chapters.In chapter one, reviews of previous works, and purposes andrnlimitations of the study have been made. In the second and thirdrnchapters, the inflect ional and derivational affixes of Oromo NOUNSrnand ADJECTIVES have been examined and compared" The inflectionalrnaffi:;~es for such grammatical categories as number t gender; and casernhave been examined and explained. Regarding their derivations thernroots from which NOUNS and ADJECTIVES may be derived and the affixesrnthat derive them have been identi fied.rnChapter five deals with some processes of nominalization andrnadjectivizationso Here, attempts have been made to describe th-e proceSDeDrnof compounding and re!ativization.rnIn chapter five, the syntactic positions and functions of NOUNSrnand ADJECTIVES along with those of p ronouns , demonstratives, andrnnumerals have been considered"rnChapter six summarizes the discussion and suggests as a possiblernconclusion that NOUNS and ADJECTIVES may be considered as constituentsrnof the class of substantives on the basis of their morphologicalrnsimilarity.