The phrase radiant boy can be interchanged with other synonyms based on the context and the intention of the writer or speaker. The word 'radiant' indicates a bright and glowing state, while 'boy' pertains to a young male individual. Some synonyms for radiant boy include 'luminous youth,' 'glowing lad,' 'brilliant youngster,' 'beamish child,' 'shimmering kid,' and 'gleaming teenager.' These terms convey the same sense of youthfulness and brightness while adding a little nuance to the description. For instance, the word 'luminous' implies a spiritual glow, while 'gleaming' indicates a shiny and polished exterior. Regardless of the synonym, the phrase radiant boy implies a positive and optimistic image, conveying energy, hope, and joyfulness.