"Dero" is a term used to describe a person who is unkempt, disheveled and seen as social outcasts. Some common synonyms for "dero" include bum, tramp, vagabond, drifter, hobo, and vagrant. All of these terms suggest a person who is homeless or who is surviving on the fringes of society. In some contexts, the word "dero" can be considered derogatory, and some people may find it offensive. As such, it is essential to use these synonyms with care and sensitivity. It is always best to use respectful language when speaking about people who may be experiencing difficult circumstances in life.