The word 'sing' can be replaced by various other words that convey the same meaning depending on the context of the sentence. Some commonly used synonyms for 'sing' are croon, warble, chirp, chant, hum, vocalize, serenade, lilt, trill, carol, yodel, and melody. Each of these words implies a slightly different style or tone of singing. For example, chirp signals a higher-pitched and lighthearted tone of singing, while chant connotes a more solemn and deliberate style. Knowing these synonyms can improve the writer's vocabulary and make their writing more precise and nuanced, adding depth and character to their literary works.