This root form (lemma) is used in 2 different forms in the NT: ἐπάγγελμα (ANS), ἐπαγγέλματα (ANP).
It is glossed in 2 different ways: ‘promise’, ‘promises’.
OET 2PET 1:4 Greek word=ἐπαγγέλματα (epangelmata) Morphology=ANP English gloss=‘promises’ SR GNT 2PET 1:4 word 12
OET 2PET 3:13 Greek word=ἐπάγγελμα (epangelma) Morphology=ANS English gloss=‘promise’ SR GNT 2PET 3:13 word 14