Prevocalically is an adverb used to describe something that occurs or is done before the act of speaking or making sounds. This word is specific to a time frame that is directly before vocalization. However, if you are seeking alternate terms to express this temporal notion, you can consider synonyms such as prelingually, before speaking, before voicing, prephonetically, or antecedently. These words all capture the sense of something happening or existing directly prior to vocal expression. Whether you opt for prevocalically or its synonyms, all these terms convey the same concept of occurring before utterance, providing options to express this idea effectively in different contexts.