A boss is someone who may be in charge of some activity within a larger organization such as a foreman of an assembly line or the owner of a small company. Bosses usually know the specific thing they are in charge of very well and have the tendency not to listen to the advice of others. I’ve known bosses of companies who argue against the advice of their accountant and give inadequate attention to the consequences.
A leader may be an expert in something but is in charge of many more diverse activities and the components that conduct them. In making decisions, he or she relies not solely on their own knowledge and experience but also to the advice of others. There have been many great leaders, such as Eisenhower, in government and business. The military especially puts heavy emphasis on “leadership” and its organizations are structured to support that concept.
Donald Trump, in my opinion, shows all the attributes of being a boss and not a leader, much less a great leader. His business acumen is questionable and his behavior toward his own party and even to his own staff disturbing. Let him go back to his T.V. expertise in “hiring” and “firing.”