The phrase "be on" has several synonyms, including "air," "broadcast," "telecast," "stream," and "show." All of these words can be used to convey the same idea of a program or event being available for public consumption. Depending on the context, different synonyms may be more appropriate - for example, "air" is typically used to describe TV or radio programs, whereas "stream" is often used for online content. Regardless of which synonym you choose, using alternate phrasing can help to prevent repetition and boredom in your writing or speaking.