This root form (lemma) is used in 2 different forms in the NT: καρδιογνώστης (NMS), καρδιογνῶστα (VMS).
It is glossed in 1 way: ‘heart_knower’.
OET ACTS 1:24 Greek word=καρδιογνῶστα (kardiognōsta) Morphology=VMS English gloss=‘heart_knower’ SR GNT ACTS 1:24 word 8
OET ACTS 15:8 Greek word=καρδιογνώστης (kardiognōstaʸs) Morphology=NMS English gloss=‘heart_knower’ SR GNT ACTS 15:8 word 4