core

[1]	pit , seed

[1]	centre , heart , core group , middle , nucleus , inside(s)
[2]	essence , marrow , heart , pith , gist , quintessence , sum and substance
[3]	kernel , substance , center , essence , gist , heart and soul , inwardness , marrow , meat , nub , pith , sum , nitty-gritty
[4]	Congress of Racial Equality
[5]	effect , essence , burden , gist
[6]	magnetic core