ROBERT VAN DE GRAAFFRobert Van de Graaff · English · Reference checkedReferenceOpen English WordNet 2024oewn2024:lemma:ROBERT VAN DE GRAAFFTier 1Ordinal163Pythagorean82Classical155Reverse296Reverse Reduction98Standard1231Final Large2601Ordinal151Reduced52Atbash791Isopsephy1744Ordinal178Abjad1310