relativist
noun/ˈɹɛl.ə.tɪv.ɪst/
Etymology From relative + -ist.
1
One who follows, believes or espouses relativism.
- Rule-circular justifications of basic logical laws — if indeed they are possible — would presumably be similarly undismaying for a logical relativist.2002, José ́Luis Bermúdez, Alan Millar, Reason and Nature: Essays in the Theory of Rationality, page 50:
2
One who studies, or contributes to, or uses, the theory of relativity