We don't have synonyms for regenerator yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are generator, regeneration and regenerate.
(n) :
(engineering) A type of heat exchanger where heat from the hot fluid is intermittently stored in a thermal storage medium before it is transferred to the cold fluid.
(n) :
(engineering) A type of heat exchanger where heat from the hot fluid is intermittently stored in a thermal storage medium before it is transferred to the cold fluid.