SynonymDefinitionAntonym.com - English Synonym Dictionary

Any of various large tropical carnivorous lizards of Africa and Asia and Australia; fabled to warn of crocodiles

A piece of electronic equipment that keeps track of the operation of a system continuously and warns of trouble

Electronic equipment that is used to check the quality or content of electronic transmissions

Display produced by a device that takes signals and displays them on a television screen or a computer monitor

An ironclad vessel built by Federal forces to do battle with the Merrimac

Someone who gives a warning so that a mistake can be avoided

Someone who supervises (an examination)

Keep tabs on; keep an eye on; keep under surveillance

Check, track, or observe by means of a receiver