The word "诙谐" is formed by combining two characters, each comprising the speech radical "讠" on the left, indicating relation to language or speech. The right component "灰" in "诙" primarily provides phonetic guidance, while the right component "皆" in "谐" similarly serves a phonetic role. Together, these characters create a compound word where the shared semantic radical emphasizes speech-related meaning, resulting in the term for humor or wit.