Crossword solverSynonyms for pentode6 crossword answers for “pentode” (7), sorted by letter count.How many letters?All6411011211411512014 letters 1tube10 letters 1vacuum tube(6,4)12 letters 1electron tube(8,4)14 letters 1thermionic tube(10,4)15 letters 1thermionic valve(10,5)20 letters 1thermionic vacuum tube(10,6,4)