They possess four faculties of discernment and exegesis not possessed by ordinary mortals, and five kinds of transcendent knowledge, so that they are characterized by supreme wisdom, and are known as prajñāvimukta. They can hear and understand all sounds in the universe, know the thoughts of others, and remember previous existences. At death, they attain nirvāna completely.
Mahāyāna Buddhism, in contrast, regards the notion, especially the limited goal, of arhat as selfish. The development of the bodhisattva, who might attain the goal but returns to help others, is held to be the logical application of the example of the Buddha and of his teaching.
Among Jains, the arhat is one who is worthy of absolute reverence. In effect, these are the tīrthaṅkaras.
"Arhat." The Concise Oxford Dictionary of World Religions. . Encyclopedia.com. (July 23, 2018). http://www.encyclopedia.com/religion/dictionaries-thesauruses-pictures-and-press-releases/arhat
"Arhat." The Concise Oxford Dictionary of World Religions. . Retrieved July 23, 2018 from Encyclopedia.com: http://www.encyclopedia.com/religion/dictionaries-thesauruses-pictures-and-press-releases/arhat