For our purposes, the 3 school of Buddhism will be Theravada, Mahayana, Vajrayana.

Shrvakas - Hearers.

Pratyeka Buddha - solitary awakened ones.

Bodhisattva - others-focused buddha being that does not enter final nirvana until helping all sentient beings out of suffering.

Japanese Esoteric Buddhist school - Shingon, Tendai, Shinnyoen.

Abhiseka - Being initiated into esoteric rights, passing on esoteric teachings/enlightenment from master to disciple.