stone (of a fruit) ②core (of an organization, team, etc.) ③nuclear weapons ④nucleus (of an atom) ⑤nucleus (of a cell)

core

nuclear fusion

nuclear bomb

kernel

nuclear warhead

(Earth's) core

core (of planets, stars, galaxies, etc.)

nuclear missile

nuclear attack

nuclear weapon

nuclear fusion reactor

tuberculosis ②concretion

nuclear warfare

nuclear explosion

nuclear (bomb) test

inner core (of Earth)

nuclear fuel

nuclear arms

nuclear reaction

don't eat plum pits (because they are poisonous)