There are various synonyms for the term "intermediate host" used in the context of parasitology. Some of the commonly used alternatives include vector, carrier, and reservoir host. A vector is a living organism that transmits infectious agents, such as viruses or bacteria, from one host to another. A carrier refers to an individual, animal, or object that harbors and spreads a pathogen without getting sick from it. A reservoir host is an animal that carries a disease-causing agent and serves as a source of infection for other animals or humans. These terms are often used interchangeably but have slightly distinct meanings based on the type of pathogen and the mode of transmission.