The word 绳索 is a typical example of a Chinese compound word formed through synonym combination, where two characters with similar meanings are joined to create a single, more precise or emphatic term. The character 绳 (shéng) primarily means "rope" or "cord", while 索 (suǒ) carries the meaning of a "large rope", "cable", or "to search". When combined, 绳索 collectively refers to a rope or cordage, often with a connotation of something sturdier, thicker, or more substantial than a simple strand, leveraging the shared semantic field of "rope-like objects" to solidify the meaning.