Crossword solverSynonyms for substantiate16 crossword answers for “substantiate” (12), sorted by letter count.How many letters?All164151637381951124 letters 1back5 letters 1prove6 letters 3back up(4,2)affirmembody7 letters 3realiserealizeconfirm8 letters 1document9 letters 5establishincarnateactualiseactualizebody forth(4,5)11 letters 2demonstratecorroborate