He and Noble gas

He noun - A very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas).

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

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

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