Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
εμπαιγμάτων mockeries LXX.Ps.38.7
εμπαίγματα their mockeries LXX.Isa.66.4

Liddell-Scott-Jones

ἔμπαιγμα (empaigma) mockery G:N-N

ἔμπαιγμα-μα, ατος, τό,

jest, mocking, delusion, [LXX]; μαγικῆς ἐμπαίγματα τέχνης[LXX+2nd c.AD+]

LSJ Scripture Refs: LXX.Isa.66.4