This is the 1292nd most frequent Japanese word.
死
Death.
The word '死' is used as a noun meaning 'death'.
彼は死を恐れている。
He is afraid of death.
The word '死' appears here as the root of a verb '死ぬ', meaning 'to die'.
彼は戦場で死んだ。
He died on the battlefield.
The word '死' is used as a concept to express 'death' in a philosophical or abstract sense.