Or else is an expression used to convey a conditional meaning that suggests the negative consequences which may occur if something is not done or achieved. Some synonyms for or else include otherwise, alternatively, if not, or, and elsewise. Otherwise implies a different course of action that should be taken, while alternatively connotes a choice between two options. If not highlights the need for a particular action to be taken, while or presents an alternative option. Elsewise is an uncommon term, but it can be used to suggest that consequences will occur if something is not done differently. Using synonyms for or else helps to add variety to writing and convey a range of meanings.