Buddha is a Sanskrit word for the one who is awake.
Anyone can become a Buddha, as Thich Nhat Hanh says:
"When you begin to practice Buddhism you begin as a part-time buddha and slowly you become a full-time buddha. Sometimes you fall back and become a part-time buddha again, but with steady practice you become a full-time buddha again. Buddhahood is within reach because, like the Buddha, you’re a human being. You can become a buddha whenever you like; the Buddha is available in the here and now, anytime, anywhere."