The word "goin'" is actually a slang term for the word "going". However, there are several synonyms for the word "going" that can be used interchangeably depending on the context. Some of these synonyms include traveling, heading, departing, leaving, moving, walking, progressing, advancing, and journeying. For example, instead of saying "I'm goin' to the store," you could say "I'm heading to the store" or "I'm leaving for the store". Similarly, instead of saying "I'm goin' on vacation," you could say "I'm traveling on vacation" or "I'm journeying on vacation". These synonyms help to add variety and nuance to our language.