The word "hastener" typically refers to someone or something that speeds up a process or speeds up time. Some synonyms for hastener include: accelerant, catalyst, expediter, facilitator, instigator, prompter, and quickener. These words all have similar meanings and can be used interchangeably with hastener in certain contexts. For example, a catalyst can be used in chemistry to speed up a reaction, while an expediter can be used in business to speed up the process of getting goods or services delivered. These synonyms are useful for adding variety to one's writing and can help to convey a more precise meaning.