Referrers are individuals or entities that refer someone or something to another person, entity, or organization. There are several synonyms for the term 'referrers', including, but not limited to, recommenders, endorsers, advocates, providers, connexions, affiliates, introducers, intermediaries, and sources. These words may be used interchangeably to describe someone or something that refers someone or something else. For instance, if you're searching for an apartment, you may ask a friend to refer you to their landlord. In this case, your friend is acting as a 'referrer' or 'provider,' as they're supplying you with a source of information.