Candledave, I have looked again at my completed grid and I still can't see anything.
In my grid there are four examples of the English version of the letter given by the first Greek word in the corrections. If I understand the information from the corrections correctly (which I am beginning to doubt) I am required to find words to form the required shapes around these letters, beginning in a cell containing the letter given by the second Greek word and ending in a cell containing the third Greek word.
Am I on the right track or not?