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C at two and Y at three is as narrow as this list gets, with one word in total and ACYLS filling the slot.
A C followed straight by Y needs a vowel in front and something workable behind, and English offers almost nothing that fits at five letters. ACYLS is the plural of acyl, a group of atoms that turns up constantly in organic chemistry.
Once C is confirmed in the second box and Y in the third, the answer is settled. There is nothing to narrow and no distribution worth reading.
That also makes it a poor shape to aim for. Guessing towards a pattern with one word behind it spends a turn you could have used testing common letters.
It is the part of a molecule left when a hydroxyl group is stripped from an acid. Chemists use the term constantly and almost nobody else does.
The C and Y both carry value, so it scores reasonably for its length. Whether it is accepted depends on the word list your game runs on.
It is more productive in longer words. This page covers five letter words only, which is why so little survives here.