Propaganda is communication that is primarily used to influence or persuade an audience to further an agenda, which may not be objective and may be selectively presenting facts to encourage a particular synthesis or perception, or using loaded language to produce an emotional rather than a rational response to the information that is being presented.
Propaganda isn’t always fake news, it can also be true stuff presented in a biased way.
Similarly, fake news isn’t always propaganda. Some is just stuff spread by trolls to make fun of people.