Regardless of the character of the vibrational modes, fluctuations in vibrational energy remain the fundamental origin of thermal transport. On the other hand, ionic transport is restricted by an activation barrier (nominally referred to as EA) that is largely determined by the potential energy landscape, i.e. the coordination environment of the mobile species (Figure ). With that, the magnitude of the fluctuation needed to move an ion is significantly increased, relative to thermal transport, since the kinetic energy of the ion has to surpass this activation barrier. Despite this conceptual difference there are strong underlying physical relationships suggesting a connection between thermal diffusons and ionic diffusion: 1) fast ionic transport is achieved in strongly disordered materials and strong disorder promotes the prevalence of thermal transport via diffusons. 2) Both transport phenomena operate within an atomic-scale random walk, in which local vibrations carry and transfer heat energy or momentum of ions (Figure b, d). 3) Anharmonic lattice vibrations enhance diffuson-mediated transport and, although the characteristic vibration of a mobile ion is usually shown using a harmonic potential well, an ion jump is an intrinsically anharmonic process. Motivated by these apparent similarities, this work aims to provide a stepping stone in unifying the concepts of thermal and ionic transport by experimentally accessing both processes and answering the following questions: 1) Are significant diffuson contributions to thermal conductivity present in superionic conductors? 2) Which vibrational modes characterize both transport processes, and 3) how does the magnitude of ion transport influence thermal transport?