It's a very technical word. It is almost always used just as a noun, but occasionally you will see it as a verb (propagandize) I would say that originally, it was considered a science, by those who practiced it. Hitler, for example, had a government minister for propaganda. Then, it was considered a novel idea, that a government to send out so much information on a topic that the information could become the widely accepted truth, even if it was not. It is now almost universally used as a negative. So if I said that 'the only information about the rebellion is propoganda' it means I do not trust the available information, it is not truth, it is what someone wants me to believe (usually a deception). This statement however, is not accusative, it just states that no reliable information is available. When you use this word, you are accusing the provider, or creator of information of deception. If this is your intent,you should identify the creator of the propaganda e.g.: 'This is nothing but Government Propaganda'

like "advertising" but in politics