The　defining　feature　of　high-entropy　alloys　(HEAs)　is　their　unprecedented　degree　of　compositional　inhomogeneity　which　influences　their　dislocation　movements.　We　demonstrate　differences　between　a　HEA　(Fe40Mn40Co10Cr10)　and　a　conventional　solution　alloy　(316L　stainless　steel)　using　acoustic　emission　(AE)　spectroscopy.　AE　measurements　under　tension　show　the　coexistence　of　two　avalanche　processes　in　Fe40Mn40Co10Cr10　HEA,　whereby　one　avalanche　process　relates　to　the　movement　of　dislocations　and　the　other　to　detwinning/twinning　processes.　These　two　avalanche　processes　exhibit　two　branches　of　the　E　∼A2　correlation.　The　dislocation　movements　in　Fe40Mn40Co10Cr10　HEA　show　systematically　longer　durations　compared　with　the　equivalent　dislocation　movements　in　the　316L　stainless　steel　and　a　bias　toward　faster　waiting　times　for　subsequent　dislocation　movements.　The　aftershock　rate,　as　identified　by　the　Omori　law,　is　the　same　for　the　two　materials.　©　2022　Author(s).