Ajutage is a specialized word that refers to the aperture or nozzle of a pipe or other vessel that directs or disperses a fluid. If you're writing about this topic and want to avoid repeating the same word or definition, you could consider using synonyms like spout, nozzle, aperture, outlet, or orifice. These words all convey similar meanings and are commonly used in technical contexts, so they should be suitable substitutes for ajutage in most cases. Additionally, you could use more general words like tube, pipe, or duct to describe the structure that the ajutage is attached to.