Hi Notnil, hi Bobbycollins,
I could be way off here but I think the original word "c....." that goes in "everything" gets changed to 'what gets let in through the "cr....."
I was initially unsure because in 5d for example you'd have 'evelry" but then I reread the preamble and it says that those "four grid
entries cannot at any stage be entered correctly".
That leaves the requisite new six words - 'chilly'. 'genie' etc.