Some Buddhists believe that an Arhat (P., arahant), who is one who has attained the goal of awakening (sambodhi) is also a Buddha. But this is not true for Mahayana Buddhism.
It is true that an Arhat is someone who has awakened (sambodhi) but an Arhat cannot awaken others. He or she simply lacks the spiritual power of compassion. This power or light animates those who come before a Buddha who, subsequently, gives them right view (samyag-dristi) which is a kind of empowerment.
Let’s think of the Buddha as the Awakener. Not only is he awakened but he is also the Awakener who is able to induce right view into someone thus to energize them so that they can sense, for the first time, their undying life force. By increasing their connection with this force they eventually attain complete nirvana by which their consciousness becomes liberated from its exclusive focus on the body. In this regard, the Buddha is sometimes referred to as the light-maker (S.i.193).