Argon and Noble gas

Argon noun - A colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere.

Noble gas and argon are semantically related. In some cases you can use "Noble gas" instead a noun "Argon".

Noble gas noun - Any of the chemically inert gaseous elements of the helium group in the periodic table.

Argon and noble gas are semantically related. Sometimes you can replace term "Argon" with "Noble gas", this terms are similar.