In this paper, we study the word of Luolü (覼縷) in several aspects of forms, sounds and meanings. Luo has three forms: 覶/覼/ . They have a same component 見 means seeing and they have different components /爾/繭which have the same meaning: reeling silk from cocoons. So the meaning of Luo (覶/覼/ ) is combing silk thread. Luo (覶/覼/ ) and Lü (縷) are cognate words with the same initials. They are synonyms that have the same meaning of putting things in order. The two words Luo (覶/覼/ ) and Lü (縷) are used together to form a synonymic compound. In case of Luo (覶/覼/ ) is not a commonly used word and Lü (縷) is normally used as a noun, thier early way of verb-using has been neglected. In that case, the synonymic compound Luolü (覼縷) has been regarded as an unanalyzable continuous word for long. As a conclusion, like Luolü (覼縷), the synonym compounding of cognate words is an important way to form binding words.