Many people are curious about the difference between dogma and doctrine. I'm asked about it surprisingly often.
It would be nice if the Church had an official dictionary I could use to answer this question, but it doesn't.
Instead, it uses terms in documents and most of the time it expects you to already know them. Sometimes it gives you a partial definition, or at least clues about what a word means, but in general it leaves the writing of dictionary-style definitions to the writers of Catholic dictionaries.
Recently I wrote a study of the terms "dogma," "doctrine," and "theology." You can read it here, but in this post I'll give you with the results in an easy-to-read form.