> I generally use 'regime' for autocratic governments

Which is fine.

"In theory, the term need not imply anything about the particular government to which it relates, and most social scientists use it in a normative and neutral manner. The term, though, can be used in a political context. It is used colloquially by some, such as government officials, media journalists, and policy makers, when referring to governments that they believe are repressive, undemocratic, or illegitimate or simply do not square with the person’s own view of the world. Used in this context, the concept of regime communicates a sense of ideological or moral disapproval or political opposition" [1].

[1] https://www.britannica.com/topic/regime