This root form (lemma) is used in 3 different forms in the NT: ἀπειλήν (AFS), ἀπειλὰς (AFP), ἀπειλῆς (GFS).
It is glossed in 3 different ways: ‘of threat’, ‘threat’, ‘threats’.
OET ACTS 4:29 Greek word=ἀπειλὰς (apeilas) Morphology=AFP English gloss=‘threats’ SR GNT ACTS 4:29 word 8
OET ACTS 9:1 Greek word=ἀπειλῆς (apeilaʸs) Morphology=GFS English gloss=‘of threat’ SR GNT ACTS 9:1 word 7
OET EPH 6:9 Greek word=ἀπειλήν (apeilaʸn) Morphology=AFS English gloss=‘threat’ SR GNT EPH 6:9 word 11