This root form (lemma) is used in 2 different forms in the NT: ἀρχάγγελος (NMS), ἀρχαγγέλου (GMS).
It is glossed in 2 different ways: ‘of an archangel’, ‘archangel’.
OET 1TH 4:16 Greek word=ἀρχαγγέλου (arⱪangelou) Morphology=GMS English gloss=‘of an archangel’ SR GNT 1TH 4:16 word 9
OET JUDE 1:9 Greek word=ἀρχάγγελος (arⱪangelos) Morphology=NMS English gloss=‘archangel’ SR GNT JUDE 1:9 word 7