This document discusses words used to compare and contrast ideas such as coordinators, subordinators, and transition words. It provides examples of how to use coordinators like "and" and "but" between and within sentences. Subordinators like "although" and "while" are used to join dependent clauses. Transition words require a semicolon or new sentence when connecting two independent clauses. Similarities are signaled by words like "like" and "both" and differences by words such as "different from" and "but". The document ends by listing some practice websites on comparing and contrasting.