嘴唇
zuǐchún · HSK 7
lip
👄 嘴唇 = 嘴 (mouth) + 唇 (lip); the two soft edges of the mouth
嘴 means mouth and 唇 on its own already means lip, so 嘴唇 doubles down to name the lips specifically. The 月 (flesh) radical in 唇 marks it as a body part. Sound: zuǐchún, second syllable rhymes with chun in churn.
嘴 — mouth 口 + 此 (phonetic) + 角 (horn)
嘴 is a semantic-phonetic compound. The 口 (mouth) component gives the meaning, while 觜 (originally 'beak/horn-tip', combining 此 and 角) supplies the sound. It first meant a bird's beak, then broadened to mean mouth, and by extension the spout or tip of any object.