The term "undercover agent" refers to a person who is secretly involved in gathering information about a particular group or organization. There are various synonyms for this term, including spy, secret agent, covert operative, intelligence officer, and infiltrator. These synonyms may denote slightly different roles and functions within the realm of espionage and intelligence gathering. For instance, a spy may be someone who operates independently of a particular organization, whereas an intelligence officer may work for a government agency. Nonetheless, all of these synonyms share the common trait of requiring the individual to operate in stealth, maintain a cover, and blend in with their surroundings to avoid detection.