The word 愉悦 is formed by combining two characters, each constructed with a semantic and phonetic component. 愉 uses the heart radical 忄 on the left to indicate emotion, with 俞 on the right primarily providing pronunciation. Similarly, 悦 also uses the heart radical 忄, with 兑 on the right primarily indicating sound. Together, these characters form a compound word where both contribute to the meaning of joy or pleasure through their shared semantic focus on emotion and their individual phonetic elements.