Carbon monoxide gas is a toxic gas that is colorless, odorless and tasteless. This gas is dangerous to humans and animals, as it can cause illness and even death if inhaled in large amounts. There are several synonyms for the term "carbon monoxide gas" that can be used interchangeably in order to avoid repetition. Some of the most common synonyms include CO gas, carbonic oxide gas, carbon oxide gas, and flue gas. It is important to be aware of the dangers of this gas and to use the proper precautions in order to prevent any harm from occurring.