Prepositive is an adjective used to describe a word or phrase placed before the noun it modifies. This term is mostly used in grammar and linguistics. While prepositive is a very specific word with a defined meaning, there are other synonyms for "prepositive" that can be used to express the same idea. These synonyms include antecedent, anterior, preceding, previous, prior, and frontmost. All of these words describe something that comes before or ahead of something else, just like prepositive. Therefore, if you want to use a different word to describe the same concept, any of these synonyms would work perfectly.