I have returned...
I have the 12 relevant words to remove in columns 2,3,4 11,12 and 13 totalling 60 letters.
I still need to find a further six symmetrically placed words with a total of 18 letters. I can see Daw(s), Nut, Hen and Haw(s). If they are right I'm obviously still short of the full set.
Any large (to account for my evident dimness) hints appreciated.