A person who sniffs something
A dog trained to find drugs or explosives by smell
A device that chemically analyses the air around the human body, or one for detecting the presence of hidden persons by chemical (or physical) means.
A person who inhales petrol fumes for a narcotic effect.
A sniffer program which targets packets of data transmitted over the Internet
A computer program that detects and records a variety of restricted information, especially the secret passwords needed to gain access to files or networks