The word "quillin" is a rare word that refers to a thick rope or cable. Its spelling is quite peculiar and can seem confusing at first glance. However, it can be broken down phonetically as /kwɪlɪn/, with the "qu" pronounced as /kw/ and the "i" pronounced as /ɪ/. Therefore, the spelling of "quillin" reflects its pronunciation accurately. While not commonly used, it is important to understand the phonetic breakdown of words to improve spelling proficiency.