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Guest
There are 5 O's and 2 M's, although the "moo moo" thing was a coincidence, and that title was just to go with the puzzle that, when solved, turned into "old macdonald had a farm".edit: another point for the words NOT being in the theme is that the prior clue MOO MOO seemed to indicate and was sort of confirmed that there were four Os (5 actually but that was a mistake?) and possibly two Ms? I'm not really following the stuff on Discord though so I might have got that wrong, so the clue names seem to be important beyond the clue itself as well.
But yeah I think it's telling us that those things aren't in the themes, especially because some of the previous guesses are explicitly included there.
EDIT: now though, what could the three letter word be? It can't be "THE" or "AND", but it also cannot be "BUT" because B and U are not in the theme (that is, if the guesses I gaveare correct - which at least for U and B seem to be the correct ones).
EDIT2: "No U" is actually pretty big if correct, that leaves us with A E I O. It also fits with the MOO MOO puzzle in the sense that that puzzle solved to "E I E I O" (no U).