Haven't read the thread as still trying to solve largely unaided. Gridfill was ok, think I have a correct grid, and have adjusted the title. Now have 23 letters and I am struggling to see how to find the three words. Would appreciate it if some kind soul could confirm:
When it says three more thematic words I am looking for words with a thematic item in them, like the 11 grid entries?
Do the words formed keep the pairs from the clues or are they completely random (presuming random at this point)?
The replaced letters are
AL, IB, AM, EL, NI, RO, CO, NA, TR, T, PO and EN?
Thanks