The word allative is specific to grammar, describing a type of case used in certain languages. However, there are several synonyms that can be used to describe the concept in a more general sense. Alternatives to allative include directional, locative, and prepositional cases. Another option could be to use terms related to movement, such as toward, unto, or in the direction of. These synonyms help to convey the idea of moving towards a particular place or person, which is the primary function of the allative case. While each synonym may have slightly different connotations, they can all be useful depending on the context in which they are used.