 This worry might be resolved by distinguishing two senses of “fundamental”: first, a sense applying to an ingredient of physical reality that is ubiquitous (or “basic” in a building-block sense), and so not even dependent on any arrangements of other entities; and second, a sense applying to an ingredient of reality that is not (entirely) constituted by or otherwise internally (as opposed to external-causally) related to the structured arrangement of some other same-category entities. We might then use the term “basic” for the first sense and reserve “fundamental” for the second sense, which aligns the latter term with the way it is used in contemporary discussions of “grounding” or metaphysical dependence in metaphysics. So understood, there is no tension in the notion of an entity or feature that is fundamental but non-basic (O’Connor 2018).