unnecessary

needlessness

necessary evil

one, 1 / the first in order, foremost / the beginning / the best / a kind of; one of something / (card games) an ace / unity / the bottom string of a shamisen or other Japanese musical instrument

(history) a 律令 (ritsuryō) position in the 後宮 (Kōkyū, “Seraglio”) that's responsible for cleaning outside and lighting the palace

single room

(historical, government) the Department of Divinities

Alternative spelling of ヒトヒト (hitohito, “human-to-human”)

Alternative spelling of ヒトヒト (hitohito, “human-to-human”)

tough base at the end of a mushroom's stem