Carbon dioxide and Dioxide

Carbon dioxide noun - A heavy odorless colorless gas formed during respiration and by the decomposition of organic substances; absorbed from the air by plants in photosynthesis.

Dioxide and carbon dioxide are semantically related. In some cases you can use "Dioxide" instead a noun phrase "Carbon dioxide".

Dioxide noun - An oxide containing two atoms of oxygen in the molecule.

Carbon dioxide and dioxide are semantically related. Sometimes you can replace phrase "Carbon dioxide" with "Dioxide", this terms are similar.