Core

anima

(center or inner part)

caparra

(automotive: deposit of a rebuilt part)

centro

(center or inner part)

cuore

(heart of a thing)

essenza

(most important part of a thing)

fondamento

(most important part of a thing)

nocciolo

(central part of fruit, containing the kernels or seeds)

nocciolo

(heart of a thing)

nucleo

(center or inner part)

nucleo

(atomic nucleus plus inner/core electrons)

nucleo

(a piece of ferromagnetic material inside a coil)

turno

(miner's underground shift)