I am pretty sure the word "metaphilosophy" is the only word for "philosophy of philosophy", but I wasn't quite sure it was the only word. Is there any other word that could be used as a synonym? Because you would think there would be other words, but upon trying to find related words, I couldn't find anything that matched the criteria.
Using a thesaurus, I got these:
hermeneutics 0.777966
gadamer 0.764499
epistemology 0.759714
intuitionism 0.756310
contextualism 0.745138
holism 0.742702
ricoeur 0.741946
hermeneutical 0.732353
rorty 0.729782
dialogism 0.723686
I am thinking there could be a word that meant "philosophy above philosophy" or some variant thereof that could have a similar meaning, but I couldn't find any such term. In law, you have the concept of "Law of laws", but I am wondering if there are similar concepts.