Usage: 6 forms in 34 verses
Form Translated As     In Verse(s)
γιγάντων giants LXX.Josh.12.4LXX.2Sam.21.18LXX.2Sam.21.22LXX.1Chr.11.15LXX.1Chr.14.9LXX.1Chr.14.13LXX.1Chr.20.4LXX.1Chr.20.6LXX.Ezek.32.27
of giants LXX.Deut.1.28LXX.Josh.13.12LXX.Prov.21.16LXX.Ezek.32.12LXX.Ezek.39.18
γίγασ a giant LXX.Gen.10.8LXX.Gen.10.9LXX.Gen.10.9LXX.1Chr.1.10LXX.Ps.19.5LXX.Ps.33.16
γίγαντοσ a giant LXX.Isa.49.24
γίγαντεσ giants LXX.Gen.6.4LXX.Gen.6.4LXX.1Chr.20.8LXX.Job.26.5LXX.Isa.13.3LXX.Isa.14.9LXX.Ezek.32.21LXX.Ezek.32.27
γίγαντασ giants LXX.Gen.14.5LXX.Num.13.33
γίγαντα a giant LXX.Isa.49.25
giant LXX.Isa.3.2LXX.Ezek.39.20

Liddell-Scott-Jones

γίγας (gigas) a giant G:N-M

γίγας [], αντος, ,

mostly in plural, “Giants”, ὑπέρθυμοι [Refs 8th c.BC+]; of Capaneus, [Refs 4th c.BC+]

__II as adjective, mighty [Refs 5th c.AD+]