Word -formation is the branch of the science of language which studies the patterns on which a language forms new lexical units,i.e.words.Marchand’s study of word - formation involves three aspects of morphology,semantics,and grammar.He suggested that nominal compounds are derived from sentences only that the underlying sentences will take on different nominal forms, which provides a detailed analysis of word - formation. Word -formation is the branch of the science of language which studies the patterns on which a language forms new lexical units, iewords. Marchand’s study of word - formation involves three aspects of morphology, semantics, and grammar .He suggested that nominal compounds are derived from sentences only that the underlying sentences will take on different nominal forms, which provides a detailed analysis of word - formation.