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

core

nuclear fusion

nuclear weapon

kernel

nuclear warhead

(Earth's) core

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

nuclear missile

nuclear attack

nuclear weapon

nuclear fusion reactor

tuberculosis

nuclear warfare

nuclear explosion

nuclear (bomb) test

inner core (of Earth)

atomic fuel

nuclear arms

nuclear reaction

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