He and This one

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).

This one and he are semantically related. In some cases you can use "This one" instead a pronoun "He".

He and this one are semantically related. You can use "He" instead a pronoun phrase "This one".