He and Sir

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).

Sir and he are semantically related. in man topic. In some cases you can use "Sir" instead a noun "He", when it comes to topics like male human.

Sir noun - Term of address for a man.

He and sir are semantically related. You can use "He" instead a noun "Sir".