When it comes to providing assistance or aid, there are various synonyms that can be used for the phrase "render a service". One could say "offer a service," "provide a service," "give service," "perform a service," "deliver a service," or simply "help out". These alternatives convey the same meaning as "rendering a service", however, they add some variation to the language in order to avoid monotony or repetition. Whatever the phrasing, the key is to communicate the notion of providing a beneficial service that creates a positive outcome for the recipient.