GREY SUBSTANCEgrey substance · English · Reference checkedReferenceOpen English WordNet 2024oewn2024:lemma:GREY SUBSTANCETier 1Ordinal159Pythagorean51Classical150Reverse192Reverse Reduction75Standard891Final Large891Ordinal126Reduced36Atbash653Isopsephy1686Ordinal165Abjad814