Barricades are physical barriers that are often used to block entry to a certain area or to prevent access to a particular object. There are several synonyms for barricade, including barrier, blockade, obstacle, obstruction, and fence. A barrier refers to any material or object that prevents passage. A blockade is a military term that describes the use of barriers to prevent enemy access. An obstacle is any impediment that hinders movement. An obstruction refers to anything that blocks the way, while a fence is a type of barrier that typically surrounds a property or area. All of these synonyms are useful in different contexts, but they all refer to physical barriers that limit or prevent movement.