The word freeboot refers to a pirate or a person who engages in piracy or illegal activities at sea. There are several synonyms for the word freeboot that provide alternative ways to describe a pirate. For example, buccaneer, privateer, corsair, or marauder all have similar meanings. Additionally, the word raider can be used to describe someone who engages in acts of plundering or pillaging. While the word freeboot may have a negative connotation, these synonyms can be used in different contexts to convey the same general meaning without carrying the same level of derogatory implications.