Radiferous is an uncommon word used to describe something or someone that emits rays or radiates. While there may not be many synonyms for radiferous, there are a few similar words that can be used. These include radiating, irradiating, beaming, and emitting. These words can be used to describe anything that gives off light, heat, or energy, such as the sun, a lamp, or a person's smile. While not as specific as radiferous, these words can still convey the idea of something or someone emitting or radiating energy or light.