mainly, primarily

(astronomy, mythology) Earth; Terra

iron

iron, the metal and the metallic chemical element / (more generally) steel / short for 鉄砲 (teppō, literally “cannon”, but in this case, refers to the poisonous fugu blowfish or dishes made from it)

nuclear / atomic / nuclear power / core / kernel

the Lord

head of the family / master, mistress / one's husband / proprietor, landlord

lord, master / main, principal

Alternative spelling of 御主 (“you”)

stairs used in emergencies