Liquid oxygen and Oxygen

Liquid oxygen noun - A bluish translucent magnetic liquid obtained by compressing gaseous oxygen and then cooling it below its boiling point; used as an oxidizer in rocket propellants.

Oxygen and liquid oxygen are semantically related. In some cases you can use "Oxygen" instead a noun phrase "Liquid oxygen".

Oxygen noun - A nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust.

Liquid oxygen and oxygen are semantically related. Sometimes you can replace phrase "Liquid oxygen" with "Oxygen", this terms are similar.