The term CHAIN PART can be broken down into two crossword solutions, LINK and LINK hover:text-barberry-yellow'>ISLE. LINK is a four letter word that refers to a connection between two or more things, often used in the context of a chain. LINK hover:text-barberry-yellow'>ISLE is also a four letter word that refers to a small island, usually surrounded by water. Together, these two words can be used to describe a part of a chain, such as a LINK between two islands.