実Fruit of plants and trees. Seeds of plants and trees. The production of fruits and seeds. Fruitfulness. To be full. To flourish. To have enough. Abundant. Wealth. Truthfulness. True. Truthfulness.
夢Dream. Something you see as if it were real when you are asleep. Something you hope to achieve in the future. A pleasant thought that takes you away from reality. Something fleeting. Uncertainty.
乃In other words. For that reason. So. A long time ago. In the past. You. A second-person pronoun for a person of equal or inferior status. The word for "no" is used in particles.
空Sky. Atmosphere. Heaven. Big. Wide. Empty. No substance. Meaningless. Useless. In Buddhism, something without substance or essence. A thing related to aviation.