This root form (lemma) is used in 2 different forms in the NT: στεναγμοῖς (DMP), στεναγμοῦ (GMS).
It is glossed in 2 different ways: ‘with groanings’, ‘groaning’.
OET ACTS 7:34 Greek word=στεναγμοῦ (stenagmou) Morphology=GMS English gloss=‘groaning’ SR GNT ACTS 7:34 word 15
OET ROM 8:26 Greek word=στεναγμοῖς (stenagmois) Morphology=DMP English gloss=‘with groanings’ SR GNT ROM 8:26 word 28