One who has reached the highest degree of saintship, so that in his next incarnation he will be a Buddha, or savior of the world.

One who has attained Enlightenment and is on the way to nirvana.

one who postpones his or her own enlightment in order to help liberate others from the cycle of birth, death, and rebirth, or a buddha who returns to work for sentient beings

(a Buddhist who has attained prajna, which is pure and unqualified knowledge; Enlightenment, who postpones nirvana)

See Ascended Master.

a compassionate being who voluntarily remains in the world of birth and death until achieving buddhahood so they can then save others by teaching the Dharma

a compassionate soul who commits to revisit Earthly life until all beings have found peace and ascended into heaven

a mortal who somehow figures out how to completely ignore both the power of Heaven and Hell