Carbon monoxide gas and Monoxide

Carbon monoxide gas noun - An odorless very poisonous gas that is a product of incomplete combustion of carbon.

Monoxide and carbon monoxide gas are semantically related. In some cases you can use "Monoxide" instead a noun phrase "Carbon monoxide gas".

Monoxide noun - An oxide containing just one atom of oxygen in the molecule.

Carbon monoxide gas and monoxide are semantically related. Sometimes you can replace phrase "Carbon monoxide gas" with "Monoxide", this terms are similar.