Kingdom is defined as the spiritual realm over which God
reigns.
Luke 17:20-21 “Being asked by the Pharisees when the
kingdom of God would come, he answered them, “The
kingdom of God is not coming in ways that can be observed,
nor will they say, ‘Look, here it is!’ or ‘There!’ for behold,
the kingdom of God is in the midst of you.”
1 Peter 2:9: “But ye are a chosen generation, a royal priesthood, a Holy Nation, a
peculiar; that ye should shew forth the praises of him who hath called you out of
darkness into his marvelous light.”
Priesthood is defined as
the Priest being the representative of the sinner in the things of God.