I'm reminded of Peirce's invention of the term pragmaticism, as distinct from "pragmatism". For that matter, there are significant points of similarity between LW-type rationality and pragmaticism, such as the notion of belief being evidence-based anticipation of future experience.
Oh my..... this is the first time I've had the words stolen out from under my fingers before I could post them. Hmm, and beaten to the punch on bringing up Pierce to boot.
You see, I've seen the word "rationalism" used to mean all five of these things at different times:
Edited to reinstate that proposed solution, since this discussion is presumably finished.