existence / being; entity

exist

a fountain pen

one thing

age, era, period (of time) / the times, spirit of the age / antiquity / a time in one's life, one's days (in college etc.)

nation; state

a land, a large place / a country in general, a region / a country as in a nation, a state / the office of emperor, the crown; affairs of state / a province of ancient Japan

three countries / Japan, China, and India / Japan, Korea, and China / all the world / Three Kingdoms of ancient China: Wei (魏), Shu (蜀), and Wu (吳)

a place name, such as that of Mount Mikuni in Gifu prefecture / a surname

a male given name