Geometric frustration is widely accepted as a paradigm to bring out a novel paramagnetic state. Quasielastic paramagnetic scattering has been studied by neutron scattering so far. However, by inelastic neutron scattering, we have very recently found three spin-excitation modes with energetic quantization, and clarified two of three levels to be spin molecules (antiferromagnetic hexamer and heptamer) in a magnetically ordered phase with lattice distortion of MgCr2O4. As one model of the mechanism of spin molecules, we consider that molecular lattice excitations, which are the first of its kind if found, are accompanied with the molecular spin excitations by a spin-lattice coupling. Therefore, using single-crystal inelastic scattering of pulsed neutrons, we propose to measure all the excitations of spin and lattice in a magnetically ordered phase of MgCr2O4.