Scientific materialism (physicalism) says that everything is fundamentally physical, and that all our sensing, perceiving, remembering, fantasising, all the activity of that which we call the mind, is really the activity of the physical brain.
Some Hindu and Greek idealist systems turn the physicalist view on its head and instead say that consciousness is the ground of all being.
Some faiths like Christianity and my former religion, Islam, say that we are immaterial souls dwelling within physical bodies, so reality is both physical and non-physical (aka dualism). Some sub-groups within these religions may be better termed pluralist. Some Sufis believe the non-physical elements have their own types - the heart (qalb), the spirit (ruh), the soul (nafs), the secret (sirr), the hidden (khafi), the most hidden (akhfa).
What does Theravada Buddhism say is fundamental?